Details of the Researcher

PHOTO

Berns Lukas
Section
Graduate School of Science
Job title
Assistant Professor
Degree
  • 博士(理学)(東京工業大学)

  • 修士(理学)(東京工業大学)

e-Rad No.
70963966

Research History 2

  • 2022/04 - Present
    Tohoku University Graduate School of Science Department of Physics Assistant Professor

  • 2019/04 - 2022/03
    Japan Society for the Promotion of Science DC1 Junior Research Fellow

Education 3

  • Tokyo Institute of Technology School of Science Department of Physics (PhD)

    2019/04 - 2022/03

  • Tokyo Institute of Technology School of Science Department of Physics (Master)

    2017/04 - 2019/03

  • Tokyo Institute of Technology School of Science Department of Physics (Undergraduate)

    2013/04 - 2017/03

Committee Memberships 3

  • 将来計画委員会 non-collider班オブザーバー

    2022/11 - 2023/12

  • T2K Collaboration T2K Young Asia Representative

    2019/07 - 2021/06

  • 新学術領域 ニュートリノで拓く素粒子と宇宙 若手の会 幹事

    2019/04 - 2020/03

Professional Memberships 1

  • The Physical Society of Japan

    2017/11 - Present

Research Interests 3

  • Neutrino Oscillation Analysis

  • Water Cherenkov detector event reconstruction

  • Neutrino flux prediction

Research Areas 1

  • Natural sciences / Particle, nuclear, cosmic-ray, and astrophysics - experiment / Neutrino experiments

Awards 12

  1. Senshukai Young Researcher's Award [no official English name]

    2024/10 Alumni Association of the Departments of Physics / Astronomy / Geophysics, Tohoku University Study of leptonic CP violation using neutrino oscillations

  2. Seiichi Tejima Research Awards for FY 2022 (Doctoral Thesis)

    2023/03 Tokyo Institute of Technology Constraints on CP Violation and Neutrino Mass Ordering with a Joint Analysis of Accelerator and Atmospheric Neutrino Oscillations

  3. 高エネルギー物理学奨励賞

    2022/10 高エネルギー物理学研究者会議 Constraints on CP violation and neutrino mass ordering with a joint analysis of accelerator and atmospheric neutrino oscillations

  4. Springer Thesis Award (Nomination)

    2022/07 Tokyo Institute of Technology Constraints on CP Violation and Neutrino Mass Ordering with a Joint Analysis of Accelerator and Atmospheric Neutrino Oscillations

  5. Best Student Award and Eugene P. Wigner Diploma

    2022/06 Ettore Majorana Foundation and Centre for Scientific Culture, International School of Subnuclear Physics 2022 “Computationally efficient frequentist statistics toward leptonic CP violation”

  6. JSPS HOPE Fellow

    2022/03 Japan Society for the Promotion of Science

  7. 2021年秋季大会、学生優秀発表賞

    2021/10 日本物理学会 「大気・加速器ニュートリノ同時解析に向けたニュートリノ振動確率計算法の開発」

  8. First Best Poster Award

    2020 新学術領域「ニュートリノで拓く素粒子と宇宙」研究会 [Machine Learning based ring reconstruction for water Cherenkov detectors]

  9. 2020年秋季大会、学生優秀発表賞

    2020 日本物理学会 「ハイパーカミオカンデ建設予定地の方角に伴うニュートリノ・ビーム不定性の評価」

  10. TAUP 2019 Poster Honorable Mention

    2019 [New ideas for ring formation and reconstruction in water Cherenkov detectors]

  11. 優秀修士論文賞

    2019 東京工業大学 Systematic Uncertainties of the T2K neutrino beam flux with improved MC tuning using NA61/SHINE replica target data

  12. 第七回高エネルギー物理春の学校 最優秀賞 [花垣賞]

    2017 将来の長基線ニュートリノ実験の感度に関する研究

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Papers 46

  1. First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data Peer-reviewed

    K. Abe, S. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. Mirabito, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, Y. Wu, A. Q. Zhang, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, R. Shibayama, R. Shimamura, S. Suzuki, K. Abe, S. Abe, N. Akhlaq, R. Akutsu, H. Alarakia-Charles, A. Ali, Y. I. Alj Hakim, S. Alonso Monsalve, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Asada, Y. Ashida, E. T. Atkin, N. Babu, M. Barbi, G. J. Barker, G. Barr, D. Barrow, P. Bates, M. Batkiewicz-Kwasniak, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D. Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, A. Chalumeau, D. Cherdack, P. S. Chong, A. Chvirova, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, F. Cormier, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, R. Dharmapal, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A. G. Goodman, A. Gorin, K. Gorshanov, M. Grassi, M. Guigue, D. R. Hadley, J. T. Haigh, S. Han, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, M. Hogan, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, A. Izmaylov, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, P. Jonsson, S. Joshi, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. Karpova, S. P. Kasetti, V. S. Kasturi, Y. Kataoka, T. Katori, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, L. Kneale, H. Kobayashi, T. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, T. Koto, K. Kowalik, Y. Kudenko, Y. Kudo, S. Kuribayashi, R. Kurjata, V. Kurochka, T. Kutter, M. Kuze, M. La Commara, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, Y. Lee, D. Leon Silverio, S. Levorato, S. Lewis, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, K. R. Long, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Malek, M. Mandal, S. Manly, A. D. Marino, L. Marti-Magro, D. G. R. Martin, M. Martini, J. F. Martin, T. Maruyama, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, P. Mehta, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, E. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, L. Molina Bueno, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, P. Novella, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, T. Odagawa, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, J. Pasternak, D. Payne, G. C. Penn, D. Pershey, M. Pfaff, L. Pickering, G. Pintaudi, C. Pistillo, B. Popov, A. J. Portocarrero Yrey, K. Porwit, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, T. Radermacher, E. Radicioni, B. Radics, M. A. Ramirez, P. N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, F. Sánchez, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, Y. Stroke, I. A. Suslov, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takifuji, H. K. Tanaka, H. Tanigawa, A. Teklu, V. V. Tereshchenko, N. Thamm, L. F. Thompson, W. Toki, C. Touramanis, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, D. Vargas, M. Varghese, G. Vasseur, E. Villa, W. G. S. Vinning, U. Virginet, T. Vladisavljevic, T. Wachala, D. Wakabayashi, H. T. Wallace, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y.-h. Xu, K. Yamamoto, T. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review Letters 134 (1) 2025/01/02

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevlett.134.011801  

    ISSN: 0031-9007

    eISSN: 1079-7114

    More details Close

    The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×1020 protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as JCP=0) and a 1.2σ exclusion of the inverted mass ordering. Published by the American Physical Society 2025

  2. Importance sampling method for Feldman-Cousins confidence intervals Peer-reviewed

    Lukas Berns

    Physical Review D 109 (9) 2024/05/08

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevd.109.092002  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    In various high-energy physics contexts, such as neutrino-oscillation experiments, several assumptions underlying the typical asymptotic confidence interval construction are violated, such that one has to resort to computationally expensive methods like the Feldman-Cousins method for obtaining confidence intervals with proper statistical coverage. By construction, the computation of intervals at high confidence levels requires fitting millions or billions of pseudoexperiments, while wasting most of the computational cost on overly precise intervals at low confidence levels. In this work, a simple importance sampling method is introduced that reuses pseudoexperiments produced for all tested parameter values in a single mixture distribution. This results in a significant error reduction on the estimated critical values, especially at high confidence levels, and simultaneously yields a correct interpolation of these critical values between the parameter values at which the pseudoexperiments were produced. The theoretically calculated performance is demonstrated numerically using a simple example from the analysis of neutrino oscillations. The relationship to similar techniques applied in statistical mechanics and p-value computations is discussed. Published by the American Physical Society2024

  3. Updated T2K measurements of muon neutrino and antineutrino disappearance using 3.6×10^21 protons on target

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, S. Alonso Monsalve, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, M. Barbi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D. Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, P. S. Chong, G. Christodoulou, A. Chvirova, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, A. Cudd, C. Dalmazzone, T. Daret, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, K. Fusshoeller, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A. G. Goodman, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, D. Henaff, A. Hiramoto, M. Hogan, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, H. T. Israel, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, J. J. Jiang, P. Jonsson, S. Joshi, C. K. Jung, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, V. Kiseeva, J. Kisiel, T. Kobata, H. Kobayashi, T. Kobayashi, L. Koch, S. Kodama, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, T. Koto, K. Kowalik, Y. Kudenko, Y. Kudo, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, M. La Commara, L. Labarga, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, M. Lamoureux, A. Langella, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, Y. Lee, C. Lin, S.-K. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, K. R. Long, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, M. Mandal, S. Manly, A. D. Marino, L. Marti-Magro, D. G. R. Martin, M. Martini, J. F. Martin, T. Maruyama, T. Matsubara, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, P. Mehta, L. Mellet, C. Metelko, M. Mezzetto, E. Miller, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, H. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, K. Nishizaki, T. Nosek, F. Nova, P. Novella, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, T. Odagawa, T. Ogawa, R. Okada, W. Okinaga, K. Okumura, T. Okusawa, N. Ospina, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, D. Pershey, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, Y. S. Prabhu, F. Pupilli, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, M. A. Ramírez, P. N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, N. Roy, A. Rubbia, A. C. Ruggeri, C. A. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, F. Shaker, M. Shiozawa, W. Shorrock, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, A. J. Speers, R. Spina, I. A. Suslov, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, S. Tairafune, S. Takayasu, A. Takeda, Y. Takeuchi, K. Takifuji, H. K. Tanaka, Y. Tanihara, M. Tani, A. Teklu, V. V. Tereshchenko, N. Teshima, N. Thamm, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, D. Vargas, M. Varghese, G. Vasseur, C. Vilela, E. Villa, W. G. S. Vinning, U. Virginet, T. Vladisavljevic, T. Wachala, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y.-h. Xu, K. Yamamoto, T. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, X. Zhao, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review D 108 (7) 2023/10/12

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevd.108.072011  

    ISSN: 2470-0010

    eISSN: 2470-0029

  4. Measurements of neutrino oscillation parameters from the T2K experiment using $3.6\times10^{21}$ protons on target

    The T2K Collaboration, K. Abe, N. Akhlaq, R. Akutsu, A. Ali, S. Alonso Monsalve, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. A. Caballero Carretero, S. Cao, A. J. Carter, S. L. Cartwright, M. G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, A. Cudd, C. Dalmazzone, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, S. Emery-Schrenk, A. Ershova, M. Feltre, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, K. Fusshoeller, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A. G. Goodman, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, H. T. Israel, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, J. J. Jiang, P. Jonsson, C. K. Jung, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, T. Kobata, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, M. La Commara, L. Labarga, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, M. Lamoureux, A. Langella, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, Y. Lee, C. Lin, S. -K. Lin, R. P. Litchfield, S. L. Liu, A. Longhin, K. R. Long, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, M. Mandal, S. Manly, A. D. Marino, L. Marti-Magro, D. G. R. Martin, M. Martini, T. Maruyama, T. Matsubara, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, G. D. Megias, L. Mellet, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th. A. Mueller, D. Munford, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, H. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, Y. Nishimura, K. Nishizaki, F. Nova, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, D. Pershey, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, Y. S. Prabhu, F. Pupilli, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. A. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, A. J. Speers, R. Spina, I. A. Suslov, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, S. Tairafune, S. Takayasu, A. Takeda, Y. Takeuchi, K. Takifuji, H. K. Tanaka, Y. Tanihara, M. Tani, A. Teklu, V. V. Tereshchenko, N. Teshima, N. Thamm, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, D. Vargas, G. Vasseur, C. Vilela, E. Villa, W. G. S. Vinning, U. Virginet, T. Vladisavljevic, T. Wachala, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y. -h. Xu, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, X. Zhao, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    The European Physical Journal C 83 (9) 2023/09/05

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1140/epjc/s10052-023-11819-x  

    eISSN: 1434-6052

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    The T2K experiment presents new measurements of neutrino oscillation parameters using $19.7(16.3)\times10^{20}$ protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional $4.7\times10^{20}$ POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on $\sin^2\theta_{13}$ and the impact of priors on the $\delta_\mathrm{CP}$ measurement. Both analyses prefer the normal mass ordering and upper octant of $\sin^2\theta_{23}$ with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on $\sin^2\theta_{13}$ from reactors, $\sin^2\theta_{23}=0.561^{+0.021}_{-0.032}$ using Feldman--Cousins corrected intervals, and $\Delta{}m^2_{32}=2.494_{-0.058}^{+0.041}\times10^{-3}~\mathrm{eV^2}$ using constant $\Delta\chi^{2}$ intervals. The CP-violating phase is constrained to $\delta_\mathrm{CP}=-1.97_{-0.70}^{+0.97}$ using Feldman--Cousins corrected intervals, and $\delta_\mathrm{CP}=0,\pi$ is excluded at more than 90\% confidence level. A Jarlskog invariant of zero is excluded at more than $2\sigma$ credible level using a flat prior in $\delta_\mathrm{CP}$, and just below $2\sigma$ using a flat prior in $\sin\delta_\mathrm{CP}$. When the external constraint on $\sin^2\theta_{13}$ is removed, $\sin^2\theta_{13}=28.0^{+2.8}_{-6.5}\times10^{-3}$, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

  5. Event reconstruction performance with new retro-reflector based designs for water Cherenkov detectors

    L Berns, S Fujigami, M Kuze, Y Yamaguchi

    Journal of Physics: Conference Series 2156 (1) 012185-012185 2021/12/01

    Publisher: IOP Publishing

    DOI: 10.1088/1742-6596/2156/1/012185  

    ISSN: 1742-6588

    eISSN: 1742-6596

  6. Recent Results from T2K

    Lukas Berns, (for the T2K Collaboration)

    Proc. of the 55th Rencontres de Moriond, Electroweak 185-189 2021/05/14

    DOI: 10.48550/arXiv.2105.06732  

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    We report on latest results from the Tokai-to-Kamioka experiment studying the disappearance of $\nu_\mu$ and appearance of $\nu_e$ from neutrino oscillation with accelerator generated neutrinos. Thanks to increase in statistics and numerous upgrades to each part of the oscillation analysis, we set the most sensitive constraints on some of the oscillation parameters, including in particular the CP-violation angle $\delta_\mathrm{CP}$. Future prospects are also briefly discussed.

  7. First measurement of $\barν_μ$ and $ν_μ$ charged-current inclusive interactions on water using a nuclear emulsion detector

    A. Hiramoto, Y. Suzuki, A. Ali, S. Aoki, L. Berns, T. Fukuda, Y. Hanaoka, Y. Hayato, A. K. Ichikawa, H. Kawahara, T. Kikawa, T. Koga, R. Komatani, M. Komatsu, Y. Kosakai, T. Matsuo, S. Mikado, A. Minamino, K. Mizuno, Y. Morimoto, K. Morishima, N. Naganawa, M. Naiki, M. Nakamura, Y. Nakamura, N. Nakano, T. Nakano, T. Nakaya, A. Nishio, T. Odagawa, S. Ogawa, H. Oshima, H. Rokujo, I. Sanjana, O. Sato, H. Shibuya, K. Sugimura, L. Suzui, H. Takagi, T. Takao, Y. Tanihara, K. Yasutome, M. Yokoyama

    Physical Review D 102 (7) 2020/08/10

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.102.072006  

    ISSN: 2470-0010

    eISSN: 2470-0029

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    This paper reports the track multiplicity and kinematics of muons, charged pions, and protons from charged-current inclusive $\bar{\nu}_{\mu}$ and $\nu_{\mu}$ interactions on a water target, measured using a nuclear emulsion detector in the NINJA experiment. A 3-kg water target was exposed to the T2K antineutrino-enhanced beam with a mean energy of 1.3 GeV. Owing to the high-granularity of the nuclear emulsion, protons with momenta down to 200 MeV/$c$ from the neutrino-water interactions were detected. We find good agreement between the observed data and model predictions for all kinematic distributions other than the number of charged pions. These results demonstrate the capability of measurements with nuclear emulsion to improve neutrino interaction models.

  8. New ideas for ring formation and reconstruction in water-Cherenkov detectors

    Lukas Berns

    Journal of Physics: Conference Series 1468 012165-012165 2020/02

    Publisher: IOP Publishing

    DOI: 10.1088/1742-6596/1468/1/012165  

    ISSN: 1742-6588

    eISSN: 1742-6596

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    Water-Cherenkov detector technology is well established as is easily seen in the almost identical designs of Kamiokande, Super- and Hyper-Kamiokande. We explore methods to further improve upon their success by extracting directional information from originally lost photons using reflectors placed in the inactive space between PMTs. The reflected photons form a secondary antipodal ring, sensitive to the vertex position and track topology. We further show how ring reconstruction algorithms can benefit from modeling variations of the Cherenkov profile due to showering. Monte Carlo based quantitative estimates are accompanied by discussions of strategies to overcome potential issues with the presented methods. A new CNN-architecture to efficiently implement the cylindrical topology and geometry is also presented.

  9. Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    NATURE 580 (7803) 339-+ 2019/10/09

    DOI: 10.1038/s41586-020-2177-0  

    ISSN: 0028-0836

    eISSN: 1476-4687

  10. A novel water-Cherenkov detector design with retro-reflectors to produce antipodal rings

    Lukas Berns

    Typeset proceedings of the poster presented at the XXVIII International Conference on Neutrino Physics and Astrophysics (Neutrino 2018). 2018/08/29

    DOI: 10.5281/zenodo.1288376  

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    Since Kamiokande, the basic design of water-Cherenkov detectors has not changed: the walls of a water tank are lined with photodetectors that capture Cherenkov photons produced by relativistic particles. However, with this design the majority of photons are lost in insensitive regions between photodetectors, while at the same time most photodetectors are outside the ring and remain dark. To fix both issues at once, we propose fixing retro-reflectors between all photodetectors. These devices will reflect uncollected photons back through their emission point onto photodetectors at the other side of the tank, producing a secondary, delayed Cherenkov ring. Numerical simulations show that, due to the parallax effect of this antipodal ring, our system can yield up to 2x improvement of detector vertex and angle resolutions. This improvement would be beneficial for kinematic selection of multi-ring events and would lower detector costs by decreasing the number of required photodetectors.

  11. First measurement of muon neutrino charged-current interactions on hydrocarbon without pions in the final state using multiple detectors with correlated energy spectra at T2K

    K. Abe, N. Akhlaq, R. Akutsu, H. Alarakia-Charles, A. Ali, Y. I. Alj Hakim, S. Alonso Monsalve, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, M. Barbi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D. Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, P. S. Chong, G. Christodoulou, A. Chvirova, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, A. Cudd, C. Dalmazzone, T. Daret, P. Dasgupta, Yu I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, K. Fusshoeller, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A.G. Goodman, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley

    Physical Review D 108 (11) 2023/12/01

    DOI: 10.1103/PhysRevD.108.112009  

    ISSN: 2470-0010

    eISSN: 2470-0029

  12. Measurements of the ν μ and ¯ ν μ -induced coherent charged pion production cross sections on 12 C by the T2K experiment Peer-reviewed

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, S. Alonso Monsalve, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, M. Barbi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D. Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, P. S. Chong, G. Christodoulou, A. Chvirova, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, A. Cudd, C. Dalmazzone, T. Daret, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A. G. Goodman, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, D. Henaff, M. Hogan, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, H. T. Israel, A. Izmaylov, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, J. J. Jiang, J. Y. Ji, P. Jonsson, S. Joshi, C. K. Jung, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, T. Katori, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, H. Kobayashi, T. Kobayashi, L. Koch, S. Kodama, A. Konaka, L. L. Kormos, Y. Koshio, T. Koto, K. Kowalik, Y. Kudenko, Y. Kudo, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, M. La Commara, L. Labarga, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, M. Lamoureux, A. Langella, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, Y. Lee, C. Lin, S.-K. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, K. R. Long, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, M. Mandal, S. Manly, A. D. Marino, L. Marti-Magro, D. G. R. Martin, M. Martini, J. F. Martin, T. Maruyama, T. Matsubara, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, P. Mehta, L. Mellet, C. Metelko, M. Mezzetto, E. Miller, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, H. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, K. Nishizaki, T. Nosek, F. Nova, P. Novella, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, T. Odagawa, W. Okinaga, K. Okumura, T. Okusawa, N. Ospina, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, D. Pershey, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, Y. S. Prabhu, F. Pupilli, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, M. A. Ramírez, P. N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, N. Roy, A. Rubbia, A. C. Ruggeri, C. A. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, F. Shaker, M. Shiozawa, W. Shorrock, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, A. J. Speers, R. Spina, I. A. Suslov, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, M. Tada, S. Tairafune, S. Takayasu, A. Takeda, Y. Takeuchi, K. Takifuji, H. K. Tanaka, M. Tani, A. Teklu, V. V. Tereshchenko, N. Thamm, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, D. Vargas, M. Varghese, G. Vasseur, C. Vilela, E. Villa, W. G. S. Vinning, U. Virginet, T. Vladisavljevic, T. Wachala, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y.-h. Xu, K. Yamamoto, T. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, X. Zhao, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review D 108 (9) 2023/11/20

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevd.108.092009  

    ISSN: 2470-0010

    eISSN: 2470-0029

  13. Scintillator ageing of the T2K near detectors from 2010 to 2021

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E.T. Atkin, S. Ban, M. Barbi, G.J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, S. Bordoni, S.B. Boyd, A. Bravar, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, N.F. Calabria, S. Cao, A.J. Carter, S.L. Cartwright, M.G. Catanesi, A. Cervera, J. Chakrani, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, A. Cudd, Yu.I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C.C. Delogu, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T.A. Doyle, O. Drapier, K.E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, S. Emery-Schrenk, A. Ershova, S. Fedotov, P. Fernandez, A.J. Finch, G.A. Fiorentini Aguirre, G. Fiorillo, M. Friend, Y. Fujii, Y. Fukuda, K. Fusshoeller, C. Giganti, V. Glagolev, M. Gonin, E.A.G. Goodman, A. Gorin, M. Grassi, M. Guigue, D.R. Hadley, J.T. Haigh, P. Hamacher-Baumann, D.A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N.C. Hastings, A. Hatzikoutelis, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, A. Holin, T.J. Holvey, N.T. Hong Van, T. Honjo, F. Iacob, A.K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, H.T. Israel, S.J. Ives, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S.J. Jenkins, C. Jesús-Valls, J.J. Jiang, P. Jonsson, C.K. Jung, P.B. Jurj, M. Kabirnezhad, A.C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S.P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, A. Knight, T. Kobata, T. Kobayashi, L. Koch, G. Kogan, A. Konaka, L.L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, M. La Commara, L. Labarga, K. Lachner, J. Lagoda, S.M. Lakshmi, M. Lamers James, I. Lamont, M. Lamoureux, D. Last, N. Latham, M. Laveder, M. Lawe, Y. Lee, C. Lin, T. Lindner, S.-K. Lin, R.P. Litchfield, S.L. Liu, A. Longhin, K.R. Long, L. Ludovici, X. Lu, T. Lux, L.N. Machado, L. Magaletti, K. Mahn, M. Malek, M. Mandal, S. Manly, A.D. Marino, L. Marti-Magro, D.G.R. Martin, M. Martini, J.F. Martin, T. Maruyama, T. Matsubara, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K.S. McFarland, C. McGrew, A. Mefodiev, G.D. Megias, L. Mellet, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th.A. Mueller, D. Munford, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, H. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C.E.R. Naseby, T.V. Ngoc, V.Q. Nguyen, K. Niewczas, Y. Nishimura, K. Nishizaki, F. Nova, P. Novella, J.C. Nugent, H.M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R.A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G.C. Penn, J.D. Perkin, D. Pershey, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, Y.S. Prabhu, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P.N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A.C. Ruggeri, C.A. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C.M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J.T. Sobczyk, H. Sobel, F.J.P. Soler, Y. Sonoda, R. Spina, H. Su, I.A. Suslov, S. Suvorov, A. Suzuki, S.Y. Suzuki, Y. Suzuki, A.A. Sztuc, M. Tada, S. Takayasu, A. Takeda, Y. Takeuchi, H.K. Tanaka, Y. Tanihara, M. Tani, V.V. Tereshchenko, N. Teshima, N. Thamm, L.F. Thompson, W. Toki, C. Touramanis, T. Towstego, K.M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, A. Vacheret, M. Vagins, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W.G.S. Vinning, T. Vladisavljevic, T. Wachala, A.V. Waldron, J.G. Walsh, Y. Wang, L. Wan, D. Wark, M.O. Wascko, A. Weber, R. Wendell, M.J. Wilking, C. Wilkinson, J.R. Wilson, K. Wood, C. Wret, J. Xia, Y.-h. Xu, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, X. Zhao, T. Zhu, M. Ziembicki, E.D. Zimmerman, M. Zito, S. Zsoldos

    Journal of Instrumentation 17 (10) P10028-P10028 2022/10/01

    Publisher: IOP Publishing

    DOI: 10.1088/1748-0221/17/10/p10028  

    eISSN: 1748-0221

    More details Close

    Abstract The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium for the measurement of charged particles produced in neutrino interactions at its near detector complex. Over 10 years of operation the measured light yield recorded by the scintillator based subsystems has been observed to degrade by 0.9–2.2% per year. Extrapolation of the degradation rate through to 2040 indicates the recorded light yield should remain above the lower threshold used by the current reconstruction algorithms for all subsystems. This will allow the near detectors to continue contributing to important physics measurements during the T2K-II and Hyper-Kamiokande eras. Additionally, work to disentangle the degradation of the plastic scintillator and wavelength shifting fibres shows that the reduction in light yield can be attributed to the ageing of the plastic scintillator. The long component of the attenuation length of the wavelength shifting fibres was observed to degrade by 1.3–5.4% per year, while the short component of the attenuation length did not show any conclusive degradation.

  14. Measurements of protons and charged pions emitted from νμ charged-current interactions on iron at a mean neutrino energy of 1.49 GeV using a nuclear emulsion detector

    H. Oshima, T. Matsuo, A. Ali, S. Aoki, L. Berns, T. Fukuda, Y. Hanaoka, Y. Hayato, A. Hiramoto, A. K. Ichikawa, H. Inamoto, A. Kasumi, H. Kawahara, T. Kikawa, R. Komatani, M. Komatsu, K. Kuretsubo, T. Marushima, H. Matsumoto, S. Mikado, A. Minamino, K. Mizuno, Y. Morimoto, K. Morishima, N. Naganawa, M. Naiki, M. Nakamura, Y. Nakamura, T. Nakano, T. Nakaya, A. Nishio, T. Odagawa, S. Ogawa, H. Rokujo, O. Sato, H. Shibuya, K. Sugimura, L. Suzui, Y. Suzuki, H. Takagi, S. Takahashi, T. Takao, Y. Tanihara, M. Watanabe, K. Yamada, K. Yasutome, M. Yokoyama, M. Yoshimoto

    Physical Review D 106 (3) 2022/08/29

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevd.106.032016  

    ISSN: 2470-0010

    eISSN: 2470-0029

  15. Prospects for neutrino astrophysics with Hyper-Kamiokande

    Takatomi Yano, K. Abe, P. Adrich, H. Aihara, R. Akutsu, I. Alekseev, A. Ali, Y. I. Alj Hakim, F. Ameli, L. H.V. Anthony, A. Araya, Y. Asaoka, V. Aushev, F. Ballester, I. Bandac, M. Barbi, G. Barr, M. Batkiewicz-Kwasniak, M. Bellato, V. Berardi, L. Bernard, E. Bernardini, L. Berns, S. Bhadra, J. Bian, A. Blanchet, A. Blondel, A. Boiano, S. Bolognesi, L. Bonavera, N. Booth, S. Bordoni, S. Borjabad, T. Boschi, D. Bose, S. B. Boyd, C. Bozza, A. Bravar, C. Bronner, L. Brown, A. Bubak, A. Buchowicz, M. Buizza Avanzini, F. S. Cafagna, N. F. Calabria, J. M. Calvo-Mozota, S. Cao, A. Carroll, M. G. Catanesi, S. Cebriàn, S. Chakraborty, J. H. Choi, S. Choubey, M. Cicerchia, J. Coleman, G. Collazuol, S. Cuen-Rochin, M. Danilov, G. Díaz López, E. De la Fuente, P. de Perio, G. De Rosa, T. Dealtry, C. J. Densham, A. Dergacheva, N. Deshmukh, M. M. Devi, F. Di Lodovico, P. Di Meo, I. Di Palma, T. A. Doyle, E. Drakopoulou, O. Drapier, J. Dumarchez, L. Eklund, S. El Hedri, J. Ellis, S. Emery, A. Esmaili, R. Esteve, S. Fedotov, J. Feng, P. Fernandez, E. Fernández-Martinez, P. Ferrario, B. Ferrazzi, A. Finch, C. Finley, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, C. Fujisawa, Y. Fukuda, G. Galinski, J. Gao, C. Garde, A. Garfagnini, S. Garode, L. Gialanella

    Proceedings of Science 395 2022/03/18

    eISSN: 1824-8039

  16. Construction status and prospects of the Hyper-Kamiokande project

    Yoshitaka Itow, K. Abe, P. Adrich, H. Aihara, R. Akutsu, I. Alekseev, A. Ali, Y. I. Alj Hakim, F. Ameli, L. H.V. Anthony, A. Araya, Y. Asaoka, V. Aushev, F. Ballester, I. Bandac, M. Barbi, G. Barr, M. Batkiewicz-Kwasniak, M. Bellato, V. Berardi, L. Bernard, E. Bernardini, L. Berns, S. Bhadra, J. Bian, A. Blanchet, A. Blondel, A. Boiano, S. Bolognesi, L. Bonavera, N. Booth, S. Bordoni, S. Borjabad, T. Boschi, D. Bose, S. B. Boyd, C. Bozza, A. Bravar, C. Bronner, L. Brown, A. Bubak, A. Buchowicz, M. Buizza Avanzini, F. S. Cafagna, N. F. Calabria, J. M. Calvo-Mozota, S. Cao, A. Carroll, M. G. Catanesi, S. Cebriàn, S. Chakraborty, J. H. Choi, S. Choubey, M. Cicerchia, J. Coleman, G. Collazuol, S. Cuen-Rochin, M. Danilov, G. Díaz López, E. De la Fuente, P. de Perio, G. De Rosa, T. Dealtry, C. J. Densham, A. Dergacheva, N. Deshmukh, M. M. Devi, F. Di Lodovico, P. Di Meo, I. Di Palma, T. A. Doyle, E. Drakopoulou, O. Drapier, J. Dumarchez, L. Eklund, S. El Hedri, J. Ellis, S. Emery, A. Esmaili, R. Esteve, S. Fedotov, J. Feng, P. Fernandez, E. Fernández-Martinez, P. Ferrario, B. Ferrazzi, A. Finch, C. Finley, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, C. Fujisawa, Y. Fukuda, G. Galinski, J. Gao, C. Garde, A. Garfagnini, S. Garode, L. Gialanella

    Proceedings of Science 395 2022/03/18

    eISSN: 1824-8039

  17. Supernova Model Discrimination with Hyper-Kamiokande

    K. Abe, P. Adrich, H. Aihara, R. Akutsu, I. Alekseev, A. Ali, F. Ameli, I. Anghel, L. H. V. Anthony, M. Antonova, A. Araya, Y. Asaoka, Y. Ashida, V. Aushev, F. Ballester, I. Bandac, M. Barbi, G. J. Barker, G. Barr, M. Batkiewicz-Kwasniak, M. Bellato, V. Berardi, M. Bergevin, L. Bernard, E. Bernardini, L. Berns, S. Bhadra, J. Bian, A. Blanchet, F. d. M. Blaszczyk, A. Blondel, A. Boiano, S. Bolognesi, L. Bonavera, N. Booth, S. Borjabad, T. Boschi, D. Bose, S . B. Boyd, C. Bozza, A. Bravar, D. Bravo-Berguño, C. Bronner, L. Brown, A. Bubak, A. Buchowicz, M. Buizza Avanzini, F. S. Cafagna, N. F. Calabria, J. M. Calvo-Mozota, S. Cao, S. L. Cartwright, A. Carroll, M. G. Catanesi, S. Cebriàn, M. Chabera, S. Chakraborty, C. Checchia, J. H. Choi, S. Choubey, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, G. Cowan, S. Cuen-Rochin, M. Danilov, G. Daz Lopez, E. De la Fuente, P. de Perio, G. De Rosa, T. Dealtry, C. J. Densham, A. Dergacheva, N. Deshmukh, M. M. Devi, F. Di Lodovico, P. Di Meo, I. Di Palma, T. A. Doyle, E. Drakopoulou, O. Drapier, J. Dumarchez, P. Dunne, M. Dziewiecki, L. Eklund, S. El Hedri, J. Ellis, S. Emery, A. Esmaili, R. Esteve, A. Evangelisti, M. Feely, S. Fedotov, J. Feng, P. Fernandez, E. Fernández-Martinez, P. Ferrario, B. Ferrazzi, T. Feusels, A. Finch, C. Finley, A. Fiorentini, G. Fiorillo, M. Fitton, K. Frankiewicz, M. Friend, Y. Fujii, Y. Fukuda, G. Galinski, J. Gao, C. Garde, A. Garfagnini, S. Garode, L. Gialanella, C. Giganti, J. J. Gomez-Cadenas, M. Gonin, J. González-Nuevo, A. Gorin, R. Gornea, V. Gousy-Leblanc, F. Gramegna, M. Grassi, G. Grella, M. Guigue, P. Gumplinger, D. R. Hadley, M. Harada, B. Hartfiel, M. Hartz, S. Hassani, N. C. Hastings, Y. Hayato, J. A. Hernando-Morata, V. Herrero, J. Hill, K. Hiraide, S. Hirota, A. Holin, S. Horiuchi, K. Hoshina, K. Hultqvist, F. Iacob, A. K. Ichikawa, W. Idrissi Ibnsalih, T. Iijima, M. Ikeda, M. Inomoto, K. Inoue, J. Insler, A. Ioannisian, T. Ishida, K. Ishidoshiro, H. Ishino, M. Ishitsuka, H. Ito, S. Ito, Y. Itow, K. Iwamoto, A. Izmaylov, N. Izumi, S. Izumiyama, M. Jakkapu, B. Jamieson, H. I. Jang, J. S. Jang, S. J. Jenkins, S. H. Jeon, M. Jiang, H. S. Jo, P. Jonsson, K. K. Joo, T. Kajita, H. Kakuno, J. Kameda, Y. Kano, P. Kalaczynski, D. Karlen, J. Kasperek, Y. Kataoka, A. Kato, T. Katori, N. Kazarian, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, M. Kikec, J. H. Kim, J. Y. Kim, S. B. Kim, S. Y. Kim, S. King, T. Kinoshita, J. Kisiel, A. Klekotko, T. Kobayashi, L. Koch, M. Koga, L. Koerich, N. Kolev, A. Konaka, L. L. Kormos, Y. Koshio, A. Korzenev, Y. Kotsar, K. A. Kouzakov, K. L. Kowalik, L. Kravchuk, A. P. Kryukov, Y. Kudenko, T. Kumita, R. Kurjata, T. Kutter, M. Kuze, K. Kwak, M. La Commara, L. Labarga, J. Lagoda, M. Lamers James, M. Lamoureux, M. Laveder, L. Lavitola, M. Lawe, J. G. Learned, J. Lee, R. Leitner, V. Lezaun, I. T. Lim, T. Lindner, R. P. Litchfield, K. R. Long, A. Longhin, P. Loverre, X. Lu, L. Ludovici, Y. Maekawa, L. Magaletti, K. Magar, K. Mahn, Y. Makida, M. Malek, M. Malinský, T. Marchi, L. Maret, C. Mariani, A. Marinelli, K. Martens, Ll. Marti, J. F. Martin, D. Martin, J. Marzec, T. Matsubara, R. Matsumoto, S. Matsuno, M. Matusiak, E. Mazzucato, M. McCarthy, N. McCauley, J. McElwee, C. McGrew, A. Mefodiev, A. Medhi, P. Mehta, L. Mellet, H. Menjo, P. Mermod, C. Metelko, M. Mezzetto, J. Migenda, P. Migliozzi, P. Mijakowski, S. Miki, E. W. Miller, H. Minakata, A. Minamino, S. Mine, O. Mineev, A. Mitra, M. Miura, R. Moharana, C. M. Mollo, T. Mondal, M. Mongelli, F. Monrabal, D. H. Moon, C. S. Moon, F. J. Mora, S. Moriyama, Th. A. Mueller, L. Munteanu, K. Murase, Y. Nagao, T. Nakadaira, K. Nakagiri, M. Nakahata, S. Nakai, Y. Nakajima, K. Nakamura, KI. Nakamura, H. Nakamura, Y. Nakano, T. Nakaya, S. Nakayama, K. Nakayoshi, L. Nascimento Machado, C. E. R. Naseby, B. Navarro-Garcia, M. Needham, T. Nicholls, K. Niewczas, Y. Nishimura, E. Noah, F. Nova, J. C. Nugent, H. Nunokawa, W. Obrebski, J. P. Ochoa-Ricoux, E. O’Connor, N. Ogawa, T. Ogitsu, K. Ohta, K. Okamoto, H. M. O’Keeffe, K. Okumura, Y. Onishchuk, F. Orozco-Luna, A. Oshlianskyi, N. Ospina, M. Ostrowski, E. O’Sullivan, L. O’Sullivan, T. Ovsiannikova, Y. Oyama, H. Ozaki, M. Y. Pac, P. Paganini, V. Palladino, V. Paolone, M. Pari, S. Parsa, J. Pasternak, C. Pastore, G. Pastuszak, D. A. Patel, M. Pavin, D. Payne, C. Peña-Garay, C. Pidcott, E. Pinzon Guerra, S. Playfer, B. W. Pointon, A. Popov, B. Popov, K. Porwit, M. Posiadala-Zezula, J.-M. Poutissou, J. Pozimski, G. Pronost, N. W. Prouse, P. Przewlocki, B. Quilain, A. A. Quiroga, E. Radicioni, B. Radics, P. J. Rajda, J. Renner, M. Rescigno, F. Retiere, G. Ricciardi, C. Riccio, B. Richards, E. Rondio, H. J. Rose, B. Roskovec, S. Roth, C. Rott, S. D. Rountree, A. Rubbia, A. C. Ruggeri, C. Ruggles, S. Russo, A. Rychter, D. Ryu, K. Sakashita, S. Samani, F. Sánchez, M. L. Sánchez, M. C. Sanchez, S. Sano, J. D. Santos, G. Santucci, P. Sarmah, I. Sashima, K. Sato, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, J. W. Seo, S. H. Seo, D. Sgalaberna, A. Shaikhiev, Z. Shan, A. Shaykina, I. Shimizu, C. D. Shin, M. Shinoki, M. Shiozawa, G. Sinnis, N. Skrobova, K. Skwarczynski, M. B. Smy, J. Sobczyk, H. W. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, B. Spisso, P. Spradlin, K. L. Stankevich, L. Stawarz, S. M. Stellacci, K. Stopa, A. I. Studenikin, S. L. Suárez Gómez, T. Suganuma, S. Suvorov, Y. Suwa, A. T. Suzuki, S. Y. Suzuki, Y. Suzuki, D. Svirida, R. Svoboda, M. Taani, M. Tada, A. Takeda, Y. Takemoto, A. Takenaka, A. Taketa, Y. Takeuchi, V. Takhistov, H. Tanaka, H. A. Tanaka, H. I. Tanaka, M. Tanaka, T. Tashiro, M. Thiesse, L. F. Thompson, J. Toledo, A. K. Tomatani-Sánchez, G. Tortone, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. R. Vagins, S. Valder, V. Valentino, G. Vasseur, A. Vijayvargi, C. Vilela, W. G. S. Vinning, D. Vivolo, T. Vladisavljevic, R. B. Vogelaar, M. M. Vyalkov, T. Wachala, J. Walker, D. Wark, M. O. Wascko, R. A. Wendell, R. J. Wilkes, M. J. Wilking, J. R. Wilson, S. Wronka, J. Xia, Z. Xie, T. Xin, Y. Yamaguchi, K. Yamamoto, C. Yanagisawa, T. Yano, S. Yen, N. Yershov, D. N. Yeum, M. Yokoyama, M. Yonenaga, J. Yoo, I. Yu, M. Yu, T. Zakrzewski, B. Zaldivar, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, K. Zietara, M. Zito, S. Zsoldos

    The Astrophysical Journal 916 (1) 15-15 2021/07/01

    Publisher: American Astronomical Society

    DOI: 10.3847/1538-4357/abf7c4  

    ISSN: 0004-637X

    eISSN: 1538-4357

  18. Research for Hadron Production Distribution to Reduce the Uncertainty on J-PARC Neutrino Beams

    Ryo Okada, Ken Sakashita, Lukas Berns, Yusuke Koshio

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019) 2021/03/26

    Publisher: Journal of the Physical Society of Japan

    DOI: 10.7566/jpscp.33.011130  

  19. First measurement using a nuclear emulsion detector of the $\nu_\mu$ charged-current cross section on iron around the 1 GeV energy region Peer-reviewed

    H Oshima, T Matsuo, A Ali, S Aoki, L Berns, T Fukuda, Y Hanaoka, Y Hayato, A Hiramoto, A K Ichikawa, H Kawahara, T Kikawa, R Komatani, M Komatsu, K Kuretsubo, T Marushima, H Matsumoto, S Mikado, A Minamino, K Mizuno, Y Morimoto, K Morishima, N Naganawa, M Naiki, M Nakamura, Y Nakamura, N Nakano, T Nakano, T Nakaya, A Nishio, T Odagawa, S Ogawa, H Rokujo, O Sato, H Shibuya, K Sugimura, L Suzui, Y Suzuki, H Takagi, S Takahashi, T Takao, Y Tanihara, R Watanabe, K Yamada, K Yasutome, M Yokoyama

    Progress of Theoretical and Experimental Physics 2021 (3) 2021/03/15

    Publisher: Oxford University Press (OUP)

    DOI: 10.1093/ptep/ptab027  

    eISSN: 2050-3911

    More details Close

    Abstract We have carried out $\nu_{\mu}$ charged-current interaction measurement on iron using an emulsion detector exposed to the T2K neutrino beam in the J-PARC neutrino facility. The data samples correspond to $4.0 \times 10^{19}$ protons on target, and the neutrino mean energy is 1.49 GeV. The emulsion detector is suitable for precision measurements of charged particles produced in neutrino–iron interactions with a low momentum threshold thanks to a thin-layered structure and sub-$\mu$m spatial resolution. The charged particles are successfully detected, and their multiplicities are measured using the emulsion detector. The cross section was measured to be $\sigma^{\mathrm{Fe } }_{\mathrm{CC } } = (1.28 \pm 0.11({\mathrm{stat. } })^{+0.12}_{-0.11}({\mathrm{syst. } })) \times 10^{-38} \, {\mathrm{cm } }^{2}/{\mathrm{nucleon } }$. The cross section in a limited kinematic phase space of induced muons, $\theta_{\mu} < 45^{\circ}$ and $p_{\mu} > 400 \, {\rm MeV}/c$, on iron was $\sigma^{\mathrm{Fe } }_{\mathrm{CC \hspace{1mm} phase \hspace{0.5mm} space } } = (0.84 \pm 0.07({\mathrm{stat. } })^{+0.07}_{-0.06}({\mathrm{syst. } })) \times 10^{-38} \, {\mathrm{cm } }^{2}/{\mathrm{nucleon } }$. The cross-section results are consistent with previous values obtained via different techniques using the same beamline, and they are reproduced well by current neutrino interaction models. These results demonstrate the capability of the detector in the detailed measurement of neutrino–nucleus interactions around the 1 GeV energy region.

  20. First T2K measurement of transverse kinematic imbalance in the muon-neutrino charged-current single-$π^+$ production channel containing at least one proton Peer-reviewed

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, G. De Rosa, T. Dealtry, C. C. Delogu, S. R. Dennis, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A. J. Finch, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, P. Jonsson, C. K. Jung, P. B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, T. Kobata, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, R. P. Litchfield, S. L. Liu, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, T. Maruyama, T. Matsubara, K. Matsushita, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th. A. Mueller, L. Munteanu, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, D. Pershey, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y. -h. Xu, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, T. Yoshida, Y. Yoshimoto, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, M. Zito, S. Zsoldos

    Phys. Rev. D 103 (11) 112009 2021/02/05

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.103.112009  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    This paper reports the first T2K measurement of the transverse kinematic imbalance in the single-$\pi^+$ production channel of neutrino interactions. We measure the differential cross sections in the muon-neutrino charged-current interaction on hydrocarbon with a single $\pi^+$ and at least one proton in the final state, at the ND280 off-axis near detector of the T2K experiment. The extracted cross sections are compared to the predictions from different neutrino-nucleus interaction event generators. Overall, the results show a preference for models which have a more realistic treatment of nuclear medium effects including the initial nuclear state and final-state interactions.

  21. T2K measurements of muon neutrino and antineutrino disappearance using 3.13×1021 protons on target

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E.{\hspace{0.167em } }T. Atkin, Y. Awataguchi, G.{\hspace{0.167em } }J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S.{\hspace{0.167em } }B. Boyd, A. Bravar, D. Bravo Bergu{\~{n } }o, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, S. Cao, S.{\hspace{0.167em } }L. Cartwright, M.{\hspace{0.167em } }G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, G. De Rosa, T. Dealtry, C.{\hspace{0.167em } }C. Delogu, S.{\hspace{0.167em } }R. Dennis, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, T.{\hspace{0.167em } }A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A.{\hspace{0.167em } }J. Finch, G.{\hspace{0.167em } }A. Fiorentini, C. Francois, M. Friend, Y. Fujii, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Guigue, D.{\hspace{0.167em } }R. Hadley, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N.{\hspace{0.167em } }C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N.{\hspace{0.167em } }T. Hong Van, T. Honjo, F. Iacob, A.{\hspace{0.167em } }K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S.{\hspace{0.167em } }J. Jenkins, C. Jes{\'{u } }s-Valls, P. Jonsson, C.{\hspace{0.167em } }K. Jung, P.{\hspace{0.167em } }B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S.{\hspace{0.167em } }P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, T. Kobata, T. Kobayashi, L. Koch, A. Konaka, L.{\hspace{0.167em } }L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, R.{\hspace{0.167em } }P. Litchfield, S.{\hspace{0.167em } }L. Liu, A. Longhin, L. Ludovici, X. Lu, T. Lux, L.{\hspace{0.167em } }N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A.{\hspace{0.167em } }D. Marino, L. Marti-Magro, T. Maruyama, T. Matsubara, K. Matsushita, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K.{\hspace{0.167em } }S. McFarl, C. McGrew, A. Mefodiev, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th.{\hspace{0.167em } }A. Mueller, L. Munteanu, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C.{\hspace{0.167em } }E.{\hspace{0.167em } }R. Naseby, T.{\hspace{0.167em } }V. Ngoc, V.{\hspace{0.167em } }Q. Nguyen, K. Niewczas, Y. Nishimura, E. Noah, T.{\hspace{0.167em } }S. Nonnenmacher, F. Nova, J. Nowak, J.{\hspace{0.167em } }C. Nugent, H.{\hspace{0.167em } }M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R.{\hspace{0.167em } }A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W.{\hspace{0.167em } }C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G.{\hspace{0.167em } }C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P.{\hspace{0.167em } }N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A.{\hspace{0.167em } }C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. S{\'{a } }nchez, G. Santucci, C.{\hspace{0.167em } }M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J.{\hspace{0.167em } }T. Sobczyk, H. Sobel, F.{\hspace{0.167em } }J.{\hspace{0.167em } }P. Soler, Y. Sonoda, R. Spina, S. Suvorov, A. Suzuki, S.{\hspace{0.167em } }Y. Suzuki, Y. Suzuki, A.{\hspace{0.167em } }A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H.{\hspace{0.167em } }K. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L.{\hspace{0.167em } }F. Thompson, W. Toki, C. Touramanis, T. Towstego, K.{\hspace{0.167em } }M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, D. Vargas, G. Vasseur, C. Vilela, W.{\hspace{0.167em } }G.{\hspace{0.167em } }S. Vinning, T. Vladisavljevic, T. Wachala, J. Walker, J.{\hspace{0.167em } }G. Walsh, Y. Wang, D. Wark, M.{\hspace{0.167em } }O. Wascko, A. Weber, R. Wendell, M.{\hspace{0.167em } }J. Wilking, C. Wilkinson, J.{\hspace{0.167em } }R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, M. Zito, S. Zsoldos

    Physical Review D 103 (1) 2021/01/26

    Publisher: American Physical Society ({APS})

    DOI: 10.1103/physrevd.103.l011101  

    ISSN: 2470-0029

  22. Improved constraints on neutrino mixing from the T2K experiment with $\mathbf{3.13\times10^{21 } }$ protons on target Peer-reviewed

    T2K Collaboration, K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, A. Bravar, D. Bravo Bergu, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, G. De Rosa, T. Dealtry, C. C. Delogu, S. R. Dennis, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, D. Douqa, T. A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A. J. Finch, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Grassi, M. Guigue, D. R. Hadley, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jes, P. Jonsson, C. K. Jung, P. B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, T. Kobata, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, R. P. Litchfield, S. L. Liu, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, T. Maruyama, T. Matsubara, K. Matsushita, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th. A. Mueller, L. Munteanu, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. S, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, T. Yoshida, Y. Yoshimoto, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, M. Zito, S. Zsoldos

    Phys. Rev. D 103 (11) 112008 2021/01/11

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.103.112008  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance and disappearance channels. This result comes from an exposure of $14.9~(16.4) \times 10^{20}$ protons on target in neutrino (antineutrino) mode. Significant improvements have been made to the neutrino interaction model and far detector reconstruction. An extensive set of simulated data studies have also been performed to quantify the effect interaction model uncertainties have on the T2K oscillation parameter sensitivity. T2K performs multiple oscillation analyses that present both frequentist and Bayesian intervals for the PMNS parameters. For fits including a constraint on \ssqthonethree from reactor data and assuming normal mass ordering T2K measures $\sin^2\theta_{23} = 0.53^{+0.03}_{-0.04}$ and $\Delta{}m^2_{32} = (2.45 \pm 0.07) \times 10^{-3}$ eV$^{2}$c$^{-4}$. The Bayesian analyses show a weak preference for normal mass ordering (89% posterior probability) and the upper $\sin^2\theta_{23}$ octant (80% posterior probability), with a uniform prior probability assumed in both cases. The T2K data exclude CP conservation in neutrino oscillations at the $2\sigma$ level.

  23. First measurement of (nu)over-bar(mu) and nu(mu) charged-current inclusive interactions on water using a nuclear emulsion detector

    Hiramoto A, Suzuki Y, Ali A, Aoki S, Berns L, Fukuda T, Hanaoka Y, Hayato Y, Ichikawa A. K, Kawahara H, Kikawa T, Koga T, Komatani R, Komatsu M, Kosakai Y, Matsuo T, Mikado S, Minamino A, Mizuno K, Morimoto Y, Morishima K, Naganawa N, Naiki M, Nakamura M, Nakamura Y, Nakano N, Nakano T, Nakaya T, Nishio A, Odagawa T, Ogawa S, Oshima H, Rokujo H, Sanjana I, Sato O, Shibuya H, Sugimura K, Suzui L, Takagi H, Takao T, Tanihara Y, Yasutome K, Yokoyama M

    PHYSICAL REVIEW D 102 (7) 2020/10/15

    DOI: 10.1103/PhysRevD.102.072006  

    ISSN: 1550-7998

  24. The Hyper-Kamiokande Experiment -- Snowmass LOI

    Hyper-Kamiokande Collaboration, :, K. Abe, P. Adrich, H. Aihara, R. Akutsu, I. Alekseev, A. Ali, F. Ameli, L. H. V. Anthony, A. Araya, Y. Asaoka, V. Aushev, I. Bandac, M. Barbi, G. Barr, M. Batkiewicz-Kwasniak, M. Bellato, V. Berardi, L. Bernard, E. Bernardini, L. Berns, S. Bhadra, J. Bian, A. Blanchet, A. Blondel, A. Boiano, S. Bolognesi, L. Bonavera, S. Borjabad, T. Boschi, D. Bose, S . B. Boyd, C. Bozza, A. Bravar, C. Bronner, A. Bubak, A. Buchowicz, M. Buizza Avanzini, F. S. Cafagna, N. F. Calabria, J. M. Calvo-Mozota, S. Cao, M. G. Catanesi, S. Chakraborty, J. H. Choi, S. Choubey, M. Cicerchia, J. Coleman, G. Collazuol, S. Cuen-Rochin, M. Danilov, E. De la Fuente, P. de Perio, G. De Rosa, T. Dealtry, C. J. Densham, A. Dergacheva, N. Deshmukh, M. M. Devi, F. Di Lodovico, P. Di Meo, I. Di Palma, T. A. Doyle, E. Drakopoulou, O. Drapier, J. Dumarchez, L. Eklund, S. El Hedri, J. Ellis, S. Emery, A. Esmaili, S. Fedotov, J. Feng, E. Fernández-Martinez, P. Ferrario, B. Ferrazzi, A. Finch, C. Finley, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, Y. Fukuda, G. Galinski, J. Gao, C. Garde, A. Garfagnini, S. Garode, L. Gialanella, C. Giganti, J. J. Gomez-Cadenas, M. Gonin, J. González-Nuevo, A. Gorin, R. Gornea, F. Gramegna, M. Grassi, G. Grella, M. Guigue, D. R. Hadley, M. Harada, M. Hartz, S. Hassani, N. C. Hastings, Y. Hayato, K. Hiraide, K. Hoshina, K. Hultqvist, F. Iacob, A. K. Ichikawa, W. Idrissi Ibnsalih, M. Ikeda, M. Inomoto, A. Ioannisian, T. Ishida, K. Ishidoshiro, H. Ishino, M. Ishitsuka, H. Ito, S. Ito, Y. Itow, K. Iwamoto, N. Izumi, S. Izumiyama, M. Jakkapu, B. Jamieson, J. S. Jang, H. S. Jo, P. Jonsson, K. K. Joo, T. Kajita, H. Kakuno, J. Kameda, Y. Kano, D. Karlen, Y. Kataoka, A. Kato, T. Katori, N. Kazarian, M. Khabibullin, A. Khotjantsev, T. Kikawa, J. Y. Kim, S. B. Kim, S. King, T. Kinoshita, J. Kisiel, A. Klekotko, T. Kobayashi, L. Koerich, N. Kolev, A. Konaka, L. L. Kormos, Y. Koshio, Y. Kotsar, K. A. Kouzakov, K. L. Kowalik, L. Kravchuk, A. P. Kryukov, Y. Kudenko, T. Kumita, R. Kurjata, T. Kutter, M. Kuze, K. Kwak, M. La Commara, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, L. Lavitola, J. Lee, R. Leitner, V. Lezaun, I. T. Lim, T. Lindner, R. P. Litchfield, K. R. Long, A. Longhin, P. Loverre, X. Lu, L. Ludovici, Y. Maekawa, L. Magaletti, K. Magar, Y. Makida, M. Malek, M. Malinský, T. Marchi, C. Mariani, A. Marinelli, K. Martens, Ll. Marti, J. F. Martin, D. Martin, J. Marzec, T. Matsubara, R. Matsumoto, N. McCauley, A. Medhi, P. Mehta, L. Mellet, H. Menjo, M. Mezzetto, J. Migenda, P. Migliozzi, S. Miki, A. Minamino, S. Mine, O. Mineev, A. Mitra, M. Miura, R. Moharana, C. M. Mollo, T. Mondal, M. Mongelli, F. Monrabal, D. H. Moon, C. S. Moon, S. Moriyama, T. Mueller, Y. Nagao, T. Nakadaira, K. Nakagiri, M. Nakahata, S. Nakai, Y. Nakajima, K. Nakamura, KI. Nakamura, H. Nakamura, Y. Nakano, T. Nakaya, S. Nakayama, K. Nakayoshi, L. Nascimento Machado, C. E. R. Naseby, B. Navarro-Garcia, M. Needham, K. Niewczas, Y. Nishimura, F. Nova, J. C. Nugent, H. Nunokawa, W. Obrebski, J. P. Ochoa-Ricoux, E. O'Connor, N. Ogawa, T. Ogitsu, K. Okamoto, H. M. O'Keeffe, K. Okumura, Y. Onishchuk, F. Orozco-Luna, A. Oshlianskyi, N. Ospina, M. Ostrowski, E. O'Sullivan, Y. Oyama, H. Ozaki, M. Y. Pac, P. Paganini, V. Palladino, M. Pari, J. Pasternak, C. Pastore, G. Pastuszak, D. A. Patel, M. Pavin, D. Payne, C. Peña-Garay, C. Pidcott, S. Playfer, B. W. Pointon, A. Popov, B. Popov, K. Porwit, M. Posiadala-Zezula, G. Pronost, N. W. Prouse, B. Quilain, A. A. Quiroga, E. Radicioni, B. Radics, P. J. Rajda, M. Rescigno, G. Ricciardi, B. Richards, E. Rondio, B. Roskovec, S. Roth, C. Rott, A. Rubbia, A. C. Ruggeri, S. Russo, A. Rychter, D. Ryu, K. Sakashita, S. Samani, F. Sánchez, M. L. Sánchez, S. Sano, J. D. Santos, G. Santucci, P. Sarmah, K. Sato, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, J. W. Seo, D. Sgalaberna, A. Shaykina, I. Shimizu, C. D. Shin, M. Shinoki, M. Shiozawa, N. Skrobova, K. Skwarczynski, M. B. Smy, J. Sobczyk, H. W. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, B. Spisso, P. Spradlin, K. L. Stankevich, L. Stawarz, S. M. Stellacci, A. I. Studenikin, S. L. Suárez Gómez, T. Suganuma, S. Suvorov, Y. Suwa, A. T. Suzuki, S. Suzuki, Y. Suzuki, D. Svirida, M. Taani, M. Tada, A. Takeda, Y. Takemoto, A. Takenaka, A. Taketa, Y. Takeuchi, H. Tanaka, H. I. Tanaka, M. Tanaka, T. Tashiro, M. Thiesse, L. F. Thompson, A. K. Tomatani-Sánchez, G. Tortone, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. R. Vagins, S. Valder, V. Valentino, G. Vasseur, A. Vijayvargi, W. G. S. Vinning, D. Vivolo, R. B. Vogelaar, M. M. Vyalkov, T. Wachala, J. Walker, D. Wark, M. O. Wascko, R. A. Wendell, J. R. Wilson, S. Wronka, J. Xia, Y. Yamaguchi, K. Yamamoto, T. Yano, N. Yershov, M. Yokoyama, J. Yoo, I. Yu, T. Zakrzewski, B. Zaldivar, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, K. Zietara, M. Zito, S. Zsoldos

    2020/09/02

    More details Close

    Hyper-Kamiokande is the next generation underground water Cherenkov detector that builds on the highly successful Super-Kamiokande experiment. The detector which has an 8.4~times larger effective volume than its predecessor will be located along the T2K neutrino beamline and utilize an upgraded J-PARC beam with 2.6~times beam power. Hyper-K's low energy threshold combined with the very large fiducial volume make the detector unique, that is expected to acquire an unprecedented exposure of 3.8~Mton$\cdot$year over a period of 20~years of operation. Hyper-Kamiokande combines an extremely diverse science program including nucleon decays, long-baseline neutrino oscillations, atmospheric neutrinos, and neutrinos from astrophysical origins. The scientific scope of this program is highly complementary to liquid-argon detectors for example in sensitivity to nucleon decay channels or supernova detection modes. Hyper-Kamiokande construction has started in early 2020 and the experiment is expected to start operations in 2027. The Hyper-Kamiokande collaboration is presently being formed amongst groups from 19 countries including the United States, whose community has a long history of making significant contributions to the neutrino physics program in Japan. US physicists have played leading roles in the Kamiokande, Super-Kamiokande, EGADS, K2K, and T2K programs.

  25. T2K measurements of muon neutrino and antineutrino disappearance using $3.13\times 10^{21}$ protons on target

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, A. Bravar, D. BravoBerguno, C. Bronner, S. Bron, A. Bubak, M. BuizzaAvanzini, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, G. DeRosa, T. Dealtry, C. C. Delogu, S. R. Dennis, C. Densham, F. DiLodovico, S. Dolan, T. A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A. J. Finch, G. A. Fiorentini, C. Francois, M. Friend, Y. Fujii, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. HongVan, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesus-Valls, P. Jonsson, X. Junjie, P. B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S. P. K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, G. De Rosa, T. Dealtry, C. C. Delogu, S. R. Dennis, C. Densham, A. Dergacheva, F. Di Lodovico, S. Dolan, T. A. Doyle, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A. J. Finch, G. A. Fiorentini, C. Francois, M. Friend, Y. Fujii, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, P. Hamacher-Baumann, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, P. Jonsson, C. K. Jung, P. B. Jurj, M. Kabirnezhad, H. Kakuno, J. Kameda, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, S. King, J. Kisiel, T. Kobata, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, R. P. Litchfield, S. L. Liu, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, T. Maruyama, T. Matsubara, K. Matsushita, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th. A. Mueller, L. Munteanu, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, V. Q. Nguyen, K. Niewczas, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, R. Spina, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, T. Yoshida, Y. Yoshimoto, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, M. Zito, S. Zsoldos

    Physical Review D 103 (1) 2020/08/18

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.103.L011101  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    We report measurements by the T2K experiment of the parameters $\theta_{23}$ and $\Delta m^2_{32}$ which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K's neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from $1.49 \times 10^{21}$ protons on target (POT) in neutrino mode and $1.64 \times 10^{21}$ POT in antineutrino mode are used. The best-fit values obtained by T2K were $\sin^2\left(\theta_{23}\right)=0.51^{+0.06}_{-0.07} \left(0.43^{+0.21}_{-0.05}\right)$ and $\Delta m^2_{32}=2.47^{+0.08}_{-0.09} \left(2.50^{+0.18}_{-0.13}\right)$\evmass for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take non-physical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.

  26. First measurement of the charged current $\overline\nu_\mu$ double differential cross section on a water target without pions in the final state

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D 102 (1) 2020/07/21

    DOI: 10.1103/physrevd.102.012007  

    ISSN: 2470-0010

    eISSN: 2470-0029

  27. Measurements of $\barν_μ$ and $\barν_μ + ν_μ$ charged-current cross-sections without detected pions nor protons on water and hydrocarbon at mean antineutrino energy of 0.86 GeV

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, D. Barrow, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, X. Junjie, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, K. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobata, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. E. R. Naseby, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, Y. Tanihara, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Progress of Theoretical and Experimental Physics 2021 (4) 2020/04/29

    Publisher: Oxford University Press (OUP)

    DOI: 10.1093/ptep/ptab014  

    eISSN: 2050-3911

    More details Close

    We report measurements of the flux-integrated $\bar{\nu}_\mu$ and $\bar{\nu}_\mu+\nu_\mu$ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean neutrino energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced $\mu^\pm$ and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, $p_{\mu}>400~{\rm MeV}/c$ and $\theta_{\mu}<30^{\circ}$, in the laboratory frame. Absence of pions and protons in the detectable phase space of "$p_{\pi}>200~{\rm MeV}/c$ and $\theta_{\pi}<70^{\circ}$", and "$p_{\rm p}>600~{\rm MeV}/c$ and $\theta_{\rm p}<70^{\circ}$" is required. In this paper, both of the $\bar{\nu}_\mu$ cross-sections and $\bar{\nu}_\mu+\nu_\mu$ cross-sections on water and hydrocarbon targets, and their ratios are provided by using D'Agostini unfolding method. The results of the integrated $\bar{\nu}_\mu$ cross-section measurements over this phase space are $\sigma_{\rm H_{2}O}\,=\,(1.082\pm0.068(\rm stat.)^{+0.145}_{-0.128}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, $\sigma_{\rm CH}\,=\,(1.096\pm0.054(\rm stat.)^{+0.132}_{-0.117}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH} = 0.987\pm0.078(\rm stat.)^{+0.093}_{-0.090}(\rm syst.)$. The $\bar{\nu}_\mu+\nu_\mu$ cross-section is $\sigma_{\rm H_{2}O} = (1.155\pm0.064(\rm stat.)^{+0.148}_{-0.129}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, $\sigma_{\rm CH}\,=\,(1.159\pm0.049(\rm stat.)^{+0.129}_{-0.115}(\rm syst.)) \times 10^{-39}~{\rm cm^{2}/nucleon}$, and $\sigma_{\rm H_{2}O}/\sigma_{\rm CH}\,=\,0.996\pm0.069(\rm stat.)^{+0.083}_{-0.078}(\rm syst.)$.

  28. Simultaneous measurement of the muon neutrino charged-current cross section on oxygen and carbon without pions in the final state at T2K

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, D. Barrow, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, S. Bienstock, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, P. Jonsson, C. K. Jung, X. Junjie, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, H. Kim, S. King, J. Kisiel, A. Knight, T. Kobata, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Lawe, M. Licciardi, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    PHYSICAL REVIEW D 101 (11) 2020/04/11

    DOI: 10.1103/PhysRevD.101.112004  

    ISSN: 1550-7998

    eISSN: 1550-2368

  29. Measurement of the charged-current electron (anti-)neutrino inclusive cross-sections at the T2K off-axis near detector ND280

    K. Abe, N. Akhlaq, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, D. Barrow, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, T. Bonus, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, T. Honjo, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, N. Izumi, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, Y. Katayama, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, H. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobata, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, D. Last, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. E. R. Naseby, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, E. Noah, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, T. Ogawa, R. Okada, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, M. Pari, W. C. Parker, S. Parsa, J. Pasternak, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, K. Skwarczynski, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, Y. Tanihara, M. Tani, N. Teshima, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, J. Xia, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    JOURNAL OF HIGH ENERGY PHYSICS (10) 2020/02/27

    DOI: 10.1007/JHEP10(2020)114  

    ISSN: 1029-8479

  30. First combined measurement of the muon neutrino and antineutrino charged-current cross section without pions in the final state at T2K

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, T. Arihara, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, D. Barrow, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, S. Bron, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, A. Eguchi, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, X. Junjie, P. B. Jurj, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, K. Kasetti, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kikutani, H. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, J. McElwee, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. E. R. Naseby, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, S. Parsa, J. Pasternak, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, G. Santucci, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    PHYSICAL REVIEW D 101 (11) 2020/02/21

    DOI: 10.1103/PhysRevD.101.112001  

    ISSN: 1550-7998

    eISSN: 1550-2368

  31. Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Asada, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, D. Barrow, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguno, C. Bronner, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. DeRosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. DiLodovico, N. Dokania, S. Dolan, T. A. Doyle, O. Drapier, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. HongVan, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesus-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Kostin, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, L. Marti-Magro, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, J. Pasternak, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, G. Pintaudi, E. S. PinzonGuerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, C. A. Ruggles, A. Rychter, K. Sakashita, F. Sanchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, T. Towstego, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    PHYSICAL REVIEW LETTERS 124 (16) 2019/11/14

    DOI: 10.1103/PhysRevLett.124.161802  

    ISSN: 0031-9007

    eISSN: 1079-7114

  32. Measurement of neutrino and antineutrino neutral-current quasielastic-like interactions on oxygen by detecting nuclear de-excitation $γ$-rays

    K. Abe, R. Akutsu, A. Ali, C. Alt, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, E. T. Atkin, Y. Awataguchi, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, D. Bravo Berguño, C. Bronner, A. Bubak, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, S. P. Kasetti, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, S. L. Liu, X. Li, A. Longhin, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, T. Odagawa, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, A. Shaykina, M. Shiozawa, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, S. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D 100 (11) 2019/10/21

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.100.112009  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    Neutrino- and antineutrino-oxygen neutral-current quasielastic-like interactions are measured at Super-Kamiokande using nuclear de-excitation $\gamma$-rays to identify signal-like interactions in data from a $14.94 \ (16.35)\times 10^{20}$ protons-on-target exposure of the T2K neutrino (antineutrino) beam. The measured flux-averaged cross sections on oxygen nuclei are $\langle \sigma_{\nu {\rm -NCQE } } \rangle = 1.70 \pm 0.17 ({\rm stat.}) ^{+ {\rm 0.51 } }_{- {\rm 0.38 } } ({\rm syst.}) \times 10^{-38} \ {\rm cm^2/oxygen}$ with a flux-averaged energy of 0.82 GeV and $\langle \sigma_{\bar{\nu} {\rm -NCQE } } \rangle = 0.98 \pm 0.16 ({\rm stat.}) ^{+ {\rm 0.26 } }_{- {\rm 0.19 } } ({\rm syst.}) \times 10^{-38} \ {\rm cm^2/oxygen}$ with a flux-averaged energy of 0.68 GeV, for neutrinos and antineutrinos, respectively. These results are the most precise to date, and the antineutrino result is the first cross section measurement of this channel. They are compared with various theoretical predictions. The impact on evaluation of backgrounds to searches for supernova relic neutrinos at present and future water Cherenkov detectors is also discussed.

  33. Measurement of the muon neutrino charged-current single $π^+$ production on hydrocarbon using the T2K off-axis near detector ND280

    K. Abe, R. Akutsu, A. Ali, C. Alt, J. Amey, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, E. T. Atkin, Y. Awataguchi, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, A. Beloshapkin, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, S. Bordoni, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, R. G. Calland, T. Campbell, S. Cao, S. L. Cartwright, R. Castillo, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, L. Cook, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duy, J. Dumarchez, P. Dunne, L. Eklund, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Gameil, A. Garcia, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, A. Gorin, M. Guigue, D. R. Hadley, L. Haegel, J. T. Haigh, P. Hamacher-Baumann, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hillairet, T. Hiraki, A. Hiramoto, S. Hirota, M. Hogan, J. Holeczek, N. T. Hong Van, F. Hosomi, K. Huang, F. Iacob, A. K. Ichikawa, M. Ikeda, J. Imber, T. Inoue, J. Insler, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, E. Iwai, K. Iwamoto, A. Izmaylov, B. Jamieson, S. J. Jenkins, C. Jesus-Valls, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, Y. Kataoka, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, P. P. Koller, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, N. Kukita, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, I. Lamont, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, Z. J. Liptak, R. P. Litcheld, S. L. Liu, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, S. Martynenko, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, L. Munteanu, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, C. Nielsen, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser T. Ovsyannikova, R. A. Owen, Y. Oyam, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, N. D. Patel, P. Paudyal, M. Pavin, D. Payne, G. C. Penn, Y. Petrov L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov K. Porwit, M. Posiadala-Zezula, J. M. Poutissou, A. Pritchard, P. Przewlocki, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Rato, M. A. Rayner, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sanchez, S. Sasaki, E. Scantamburlo, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, A. Shaykina, M. Shiozawa, T. Shirahige, W. Shorrock, A. Shvartsman, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, Y. Suda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, S. Tanaka, T. Thakore, L. F. Thompson, S. Tobayama, W. Toki, T. Tomura, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, S. Valder, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, W. G. S. Vinning, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, J. G. Walsh, C. W. Walter, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    PHYSICAL REVIEW D 101 (1) 2019/09/09

    DOI: 10.1103/PhysRevD.101.012007  

    ISSN: 2470-0010

    eISSN: 2470-0029

  34. J-PARC Neutrino Beamline Upgrade Technical Design Report

    K. Abe, H. Aihara, A. Ajmi, C. Alt, C. Andreopoulos, M. Antonova, S. Aoki, Y. Asada, Y. Ashida, A. Atherton, E. Atkin, S. Ban, F. C. T. Barbato, M. Barbi, G. J. Barker, G. Barr, M. Batkiewicz, A. Beloshapkin, V. Berardi, L. Berns, S. Bhadra, J. Bian, S. Bienstock, A. Blondel, S. Bolognesi, J. Borg, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, S. Bron, C. Bronner, M. Buizza Avanzini, N. F. Calabria, J. Calcutt, R. G. Calland, D. Calvet, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, A. Clifton, G. Cogo, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, A. Delbart, A. De Roeck, G. De Rosa, T. Dealtry, A. Dell'acqua, P. F. Denner, S. R. Dennis, C. Densham, D. Dewhurst, F. Di Lodovico, S. Dolan, N. Dokania, D. Doqua, O. Drapier, K. E. Duffy, J. Dumarchez, P. J. Dunne, M. Dziewiecki, L. Eklund, S. Emery-Schrenk, S. Fedotov, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, K. Fusshoeller, A. Gendotti, C. Giganti, F. Gizzarelli, M. Gonin, A. Gorin, F. Gramegna, M. Guigue, D. R. Hadley, J. T. Haigh, S. -P. Hallsjö, P. Hamacher-Baumann, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, F. Iacob, A. K. Ichikawa, M. Ikeda, J. Imber, T. Ishida, T. Ishii, T. Ishii, M. Ishitsuka, E. Iwai, K. Iwamoto, A. Izmaylov, B. Jamieson, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. Kasetti, Y. Kataoka, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, A. Korzenev, Y. Koshio, K. Kowalik, W. Kropp, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, I. Lamont, M. Lamoureux, D. Last, M. Laveder, M. Lawe, T. Lindner, Z. J. Liptak, R. P. Litchfield, S. Liu, K. R. Long, A. Longhin, J. P. Lopez, L. Ludovici, X. Lu, T. Lux, L. Magaletti, L. Magro, K. Mahn, M. Malek, S. Manly, T. Marchi, L. Maret, A. D. Marino, J. F. Martin, S. Martynenko, T. Maruyama, T. Matsubara, K. Matsushita, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, P. Mijakowski, J. Mijakowski, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, T. V. Ngoc, K. Nishikawa, Y. Nishimura, T. Nonnenmacher, F. Nova, P. Novella, J. Nowak, J. C. Nugent, H. M. O'Keeffe, T. Odagawa, R. Ohta, K. Okamoto, K. Okumura, T. Okusawa, T. Ovsyannikova, R. A. Owen, Y. Oyama, V. Palladino, V. Paolone, M. Pari, W. Parker, S. Parsa, J. Pasternak, C. Pastore, M. Pavin, D. Payne, J. D. Perkin, L. Pickard, L. Pickering, E. S. Pinzon Guerra, B. Popov, M. Posiadala-Zezula, J. -M. Poutissou, R. Poutissou, J. Pozimski, P. Przewlocki, H. Przybilsk, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, P. Rojas, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, C. A. Ruggles, A. Rychter, K. Sakashita, F. Sánchez, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikina, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, M. Shiozawa, T. Shirahige, W. Shorrock, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, L. Southwell, R. Spina, J. Steinmann, T. Stewart, P. Stowell, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, J. Swierblewski, M. Szeptycka, S. Szoldos, A. Sztuc, R. Tacik, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, L. F. Thompson, W. Toki, T. Tomura, C. Touramanis, K. Tsui, T. Tsukamoto, M. Tzanov, M. A. Uchida, Y. Uchida, M. Vagins, N. H. Van, G. Vasseur, T. Viant, C. Vilela, T. Wachala, C. W. Walter, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, R. J. Wilkes, M. J. Wilking, J. R. Wilson, R. J. Wilson, K. Wood, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, T. Yuan, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, M. Ziembicki, E. D. Zimmerman, M. Zito, E. Hamada, N. Higashi, E. Hirose, Y. Igarashi, M. Iida, M. Iio, M. Ikeno, N. Kimura, N. Kurosawa, Y. Makida, T. Nakamoto, T. Ogitsu, H. Ohhata, R. Okada, T. Okamura, M. Onaka, K. Sasaki, S. Shimazaki, M. Shoji, M. Sugano, K. Tanaka, M. Tanaka, A. Terashima, T. Tomaru, T. Uchida, M. Yoshida

    2019/08/14

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    In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to $2\times{}10^{22}$ protons-on-target in the next decade, aiming at an initial observation of CP violation with $3\sigma$ or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described.

  35. Measurement of the $ν_μ$ charged-current cross sections on water, hydrocarbon, iron, and their ratios with the T2K on-axis detectors

    K. Abe, R. Akutsu, A. Ali, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Awataguchi, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondely, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulouy, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Hosomi, A. K. Ichikawa, M. Ikeda, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, C. Jesus, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, T. Lux, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, T. Maruyama, T. Matsubara, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sanchez, S. Sasaki, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, A. Shaykina, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Progress of Theoretical and Experimental Physics 2019 (9) 2019/04/21

    Publisher: Oxford University Press (OUP)

    DOI: 10.1093/ptep/ptz070  

    eISSN: 2050-3911

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    We report a measurement of the flux-integrated $\nu_{\mu}$ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron are $\sigma^{\rm{H_{2}O } }_{\rm{CC } }$ = (0.840$\pm 0.010$(stat.)$^{+0.10}_{-0.08}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon, $\sigma^{\rm{CH } }_{\rm{CC } }$ = (0.817$\pm 0.007$(stat.)$^{+0.11}_{-0.08}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon, and $\sigma^{\rm{Fe } }_{\rm{CC } }$ = (0.859$\pm 0.003$(stat.) $^{+0.12}_{-0.10}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon respectively, for a restricted phase space of induced muons: $\theta_{\mu}<45^{\circ}$ and $p_{\mu}>$0.4 GeV/$c$ in the laboratory frame. The measured cross section ratios are ${\sigma^{\rm{H_{2}O } }_{\rm{CC } } }/{\sigma^{\rm{CH } }_{\rm{CC } } }$ = 1.028$\pm 0.016$(stat.)$\pm 0.053$(syst.), ${\sigma^{\rm{Fe } }_{\rm{CC } } }/{\sigma^{\rm{H_{2}O } }_{\rm{CC } } }$ = 1.023$\pm 0.012$(stat.)$\pm 0.058$(syst.), and ${\sigma^{\rm{Fe } }_{\rm{CC } } }/{\sigma^{\rm{CH } }_{\rm{CC } } }$ = 1.049$\pm 0.010$(stat.)$\pm 0.043$(syst.). These results, with an unprecedented precision for the measurements of neutrino cross sections on water in the studied energy region, show good agreement with the current neutrino interaction models used in the T2K oscillation analyses.

  36. Search for heavy neutrinos with the T2K near detector ND280

    K. Abe, R. Akutsu, A. Ali, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Awataguchi, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, L. Haegel, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Hosomi, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, C. Jesus, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, P. P. Koller, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, Z. J. Liptak, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, T. Lux, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, T. Maruyama, T. Matsubara, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, S. Sasaki, E. Scantamburlo, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, A. Shaykina, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, Y. Suda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, T. Thakore, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D 100 (5) 2019/02/20

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.100.052006  

    ISSN: 2470-0010

    eISSN: 2470-0029

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    This paper reports on the search for heavy neutrinos with masses in the range $140 < M_N < 493$ MeV/c$^2$ using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are $N \to \ell^{\pm}_{\alpha} \pi^{\mp}$ and $N \to \ell^+_{\alpha} \ell^-_{\beta} \nu (\bar\nu)$ ($\alpha,\beta=e,\mu$). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heavy neutrinos to electron-, muon- and tau- flavoured currents ($U_e^2$, $U_{\mu}^2$, $U_{\tau}^2$) as a function of the heavy neutrino mass, e.g. $U_e^2 < 10^{-9}$ at $90\%$ C.L. for a mass of $390$ MeV/c$^2$. These constraints are competitive with previous experiments.

  37. Search for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295 km

    K. Abe, R. Akutsu, A. Ali, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Awataguchi, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Hosomi, F. Iacob, A. K. Ichikawa, M. Ikeda, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, C. Jesus, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, T. Lux, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, T. Maruyama, T. Matsubara, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, L. Molina Bueno, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, B. Radics, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, S. Sasaki, C. M. Schloesser, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, A. Shaykina, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D 99 (7) 2019/02/18

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.99.071103  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    We perform a search for light sterile neutrinos using the data from the T2K far detector at a baseline of 295 km, with an exposure of 14.7 (7.6)$\times 10^{20}$ protons on target in neutrino (antineutrino) mode. A selection of neutral current interaction samples are also used to enhance the sensitivity to sterile mixing. No evidence of sterile neutrino mixing in the 3+1 model was found from a simultaneous fit to the charged-current muon, electron and neutral current neutrino samples. We set the most stringent limit on the sterile oscillation amplitude $\sin^2\theta_{24}$ for the sterile neutrino mass splitting $\Delta m^2_{41}<3\times 10^{-3}$ eV$^2/c^4$.

  38. Search for neutral-current induced single photon production at the ND280 near detector in T2K

    K. Abe, R. Akutsu, A. Ali, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Awataguchi, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz-Kwasniak, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, J. T. Haigh, P. Hamacher-Baumann, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, N. T. Hong Van, F. Hosomi, A. K. Ichikawa, M. Ikeda, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, C. Jesus, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, T. Lux, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, T. Maruyama, T. Matsubara, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, M. Miura, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, W. C. Parker, P. Paudyal, M. Pavin, D. Payne, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, S. Sasaki, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, A. Shaykina, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, Z. Vallari, D. Vargas, G. Vasseur, C. Vilela, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Journal of Physics G: Nuclear and Particle Physics 46 (8) 08LT01-08LT01 2019/02/11

    Publisher: IOP Publishing

    DOI: 10.1088/1361-6471/ab227d  

    ISSN: 0954-3899

    eISSN: 1361-6471

    More details Close

    Neutrino neutral-current induced single photon production is a sub-leading order process for accelerator-based neutrino beam experiments including T2K. It is, however, an important process to understand because it is a background for electron (anti)neutrino appearance oscillation experiments. Here, we performed the first search of this process below 1 GeV using the fine-grained detector at the T2K ND280 off-axis near detector. By reconstructing single photon kinematics from electron-positron pairs, we achieved 95\% pure gamma ray sample from 5.738$\times 10^{20}$ protons-on-targets neutrino mode data. We do not find positive evidence of neutral current induced single photon production in this sample. We set the model-dependent upper limit on the cross-section for this process, at 0.114$\times 10^{-38}$ cm$^2$ (90\% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of $\left<E_\nu\right>\sim 0.6$ GeV. This is the first limit on this process below 1 GeV which is important for current and future oscillation experiments looking for electron neutrino appearance oscillation signals.

  39. T2K ND280 Upgrade -- Technical Design Report

    K. Abe, H. Aihara, A. Ajmi, C. Andreopoulos, M. Antonova, S. Aoki, Y. Asada, Y. Ashida, A. Atherton, E. Atkin, D. Attié, S. Ban, M. Barbi, G. J. Barker, G. Barr, M. Batkiewicz, A. Beloshapkin, V. Berardi, L. Berns, S. Bhadra, J. Bian, S. Bienstock, A. Blondel, J. Boix, S. Bolognesi, J. Borg, S. Bordoni, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, D. Browning, M. Buizza Avanzini, F. Cadoux, N. F. Calabria, J. Calcutt, R. G. Calland, D. Calvet, T. Campbell, S. Cao, S. L. Cartwright, R. Castillo, M. G. Catanesi, W. Ceria, A. Cervera, A. Chappell, D. Cherdack, N. Chikuma, G. Christodoulou, M. Cicerchia, A. Clifton, G. Cogo, P. Colas, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, A. Delbart, A. De Roeck, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, R. de Oliveira, D. Dewhurst, F. Di Lodovico, N. Dokania, S. Dolan, D. Douqa, O. Drapier, K. E. Duffy, J. Dumarchez, P. J. Dunne, M. Dziewiecki, S. Emery-Schrenk, A. Evangelisti, Y. Favre, S. Fedotov, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, M. Fitton, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, R. Fukuda, Y. Fukuda, A. Garcia, C. Giganti, F. Gizzarelli, M. Gonin, A. Gorin, F. Gramegna, M. Guida, M. Guigue, D. R. Hadley, L. Haegel, J. T. Haigh, P. Hamacher-Baumann, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, Y. Hayato, A. Hiramoto, M. Hogan, R. Howell, J. Holeczek, F. Iacob, A. K. Ichikawa, M. Ikeda, J. Imber, R. A. Intonti, T. Ishida, T. Ishii, T. Ishii, M. Ishitsuka, E. Iwai, K. Iwamoto, A. Izmaylov, B. Jamieson, C. Jesus-Valls, M. Jiang, S. Johnson, J. H. Jo, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. Kasetti, Y. Kataoka, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, H. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, A. Konaka, L. L. Kormos, A. Korzenev, U. Kose, A. Kostin, Y. Koshio, K. Kowalik, W. Kropp, Y. Kudenko, S. Kuribayashi, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, I. Lamont, M. Lamoureux, M. Laveder, M. Lawe, T. Lindner, Z. J. Liptak, R. P. Litchfield, X. Li, S. Liu, K. R. Long, A. Longhin, J. P. Lopez, P. F. Loverre, L. Ludovici, X. Lu, T. Lux, L. Magaletti, L. Magro, K. Mahn, M. Malek, S. Manly, T. Marchi, L. Maret, A. D. Marino, J. F. Martin, S. Martynenko, T. Maruyama, J. Marzec, T. Matsubara, K. Matsushita, V. Matveev, K. Mavrokoridis, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, B. Mehl, P. Mermod, C. Metelko, M. Mezzetto, J. Michalowski, P. Mijakowski, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, D. Mladenov, S. Monsalvo, S. Moriyama, J. Morrison, Th. A. Mueller, J. Mundet, L. Munteanu, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, A. Nakamura, K. G. Nakamura, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, L. Nascimento Machado, M. Nessi, T. V. Ngoc, K. Nishikawa, Y. Nishimura, E. Noah, T. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, T. Odagawa, R. Ohta, K. Okamoto, K. Okumura, T. Okusawa, Y. Orain, T. Ovsyannikova, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, J. M. Parraud, M. Pari, W. Parker, S. Parsa, J. Pasternak, C. Pastore, M. Pavin, D. Payne, A. Pepato, J. D. Perkin, F. Pietropaolo, L. Pickard, L. Pickering, E. S. Pinzon Guerra, O. Pizzirusso, B. Popov, J. Porthault, M. Posiadala-Zezula, J. -M. Poutissou, R. Poutissou, J. Pozimski, P. Przewlocki, H. Przybilski, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, M. Ravonel, M. A. M. Rayner, E. Reinherz-Aronis, F. Resnati, M. Riallot, C. Riccio, P. Rojas, G. Romanino, E. Rondio, F. Rossi, S. Roth, A. Rychter, K. Sakashita, F. Sánchez, E. Scantamburlo, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikina, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, M. Shiozawa, T. Shirahige, W. Shorrock, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, L. Southwell, R. Spina, J. Steinmann, T. Stewart, P. Stowell, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, M. Szeptycka, S. Szoldos, A. Sztuc, J. Swierblewski, R. Tacik, M. Tada, M. Tajima, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. A. Tanaka, A. Teklu, L. F. Thompson, W. Toki, T. Tomura, C. Touramanis, T. Tsukamoto, M. Tzanov, M. A. Uchida, Y. Uchida, M. Vagins, Z. Vallari, N. H. Van, D. Vargas, G. Vasseur, T. Wachala, C. W. Walter, D. Wark, M. O. Wascko, A. Weber, R. Wendell, L. Whitehead, R. J. Wilkes, M. J. Wilking, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, T. Yuan, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, M. Ziembicki, P. Zilberman, E. D. Zimmerman, M. Zito

    2019/01/11

    More details Close

    In this document, we present the Technical Design Report of the Upgrade of the T2K Near Detector ND280. The goal of this upgrade is to improve the Near Detector performance to measure the neutrino interaction rate and to constrain the neutrino interaction cross-sections so that the uncertainty in the number of predicted events at Super-Kamiokande is reduced to about 4%. This will allow to improve the physics reach of the T2K-II project. This goal is achieved by modifying the upstream part of the detector, adding a new highly granular scintillator detector (Super-FGD), two new TPCs (High-Angle TPC) and six TOF planes. Details about the detector concepts, design and construction methods are presented, as well as a first look at the test-beam data taken in Summer 2018. An update of the physics studies is also presented.

  40. Measurements of $π^{\pm}$, $K^{\pm}$ and proton yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

    The NA61/SHINE Collaboration, :, N. Abgrall, A. Aduszkiewicz, E. V. Andronov, T. Antićić, B. Baatar, M. Baszczyk, S. Bhosale, A. Blondel, M. Bogomilov, A. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, S. A. Bunyatov, O. Busygina, A. Bzdak, H. Cherif, M. Ćirković, T. Czopowicz, A. Damyanova, N. Davis, M. Deveaux, W. Dominik, P. Dorosz, J. Dumarchez, R. Engel, A. Ereditato, G. A. Feofilov, L. Fields, Z. Fodor, A. Garibov, M. Gaździcki, O. Golosov, M. Golubeva, K. Grebieszkow, F. Guber, A. Haesler, T. Hasegawa, A. E. Hervé, S. N. Igolkin, S. Ilieva, A. Ivashkin, S. R. Johnson, K. Kadija, E. Kaptur, N. Kargin, E. Kashirin, M. Kiełbowicz, V. A. Kireyeu, V. Klochkov, T. Kobayashi, V. I. Kolesnikov, D. Kolev, A. Korzenev, V. N. Kovalenko, K. Kowalik, S. Kowalski, M. Koziel, A. Krasnoperov, W. Kucewicz, M. Kuich, A. Kurepin, D. Larsen, A. László, T. V. Lazareva, M. Lewicki, K. Łojek, B. Łysakowski, V. V. Lyubushkin, M. Maćkowiak-Pawłowska, Z. Majka, B. Maksiak, A. I. Malakhov, D. Manić, A. Marchionni, A. Marcinek, A. D. Marino, K. Marton, H. J. Mathes, T. Matulewicz, V. Matveev, G. L. Melkumov, A. O. Merzlaya, B. Messerly, Ł. Mik, G. B. Mills, S. Morozov, S. Mrówczyński, Y. Nagai, T. Nakadaira, M. Naskręt, K. Nishikawa, V. Ozvenchuk, V. Paolone, M. Pavin, O. Petukhov, C. Pistillo, R. Płaneta, P. Podlaski, B. A. Popov, M. Posiadała-Zezula, D. S. Prokhorova, S. Puławski, J. Puzović, W. Rauch, M. Ravonel, R. Renfordt, E. Richter-Wąs, D. Röhrich, E. Rondio, M. Roth, B. T. Rumberger, A. Rustamov, M. Rybczynski, A. Rybicki, A. Sadovsky, K. Sakashita, K. Schmidt, T. Sekiguchi, I. Selyuzhenkov, A. Yu. Seryakov, P. Seyboth, M. Shibata, M. Słodkowski, A. Snoch, P. Staszel, G. Stefanek, J. Stepaniak, M. Strikhanov, H. Ströbele, T. Šuša, M. Tada, A. Taranenko, A. Tefelska, D. Tefelski, V. Tereshchenko, A. Toia, R. Tsenov, L. Turko, R. Ulrich, M. Unger, F. F. Valiev, D. Veberič, V. V. Vechernin, M. Walewski, A. Wickremasinghe, Z. Włodarczyk, A. Wojtaszek-Szwarc, O. Wyszyński, L. Zambelli, E. D. Zimmerman, R. Zwaska, The T2K Beam Group, :, L. Berns, G. A. Fiorentini, M. Friend, M. Hartz, T. Vladisavljevic, M. Yu

    2018/08/15

    DOI: 10.1140/epjc/s10052-019-6583-0  

    More details Close

    Measurements of the $\pi^{\pm}$, $K^{\pm}$, and proton double differential yields emitted from the surface of the 90-cm-long carbon target (T2K replica) were performed for the incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS using data collected during 2010 run. The double differential $\pi^{\pm}$ yields were measured with increased precision compared to the previously published NA61/SHINE results, while the $K^{\pm}$ and proton yields were obtained for the first time. A strategy for dealing with the dependence of the results on the incoming proton beam profile is proposed. The purpose of these measurements is to reduce significantly the (anti)neutrino flux uncertainty in the T2K long-baseline neutrino experiment by constraining the production of (anti)neutrino ancestors coming from the T2K target.

  41. Search for CP violation in Neutrino and Antineutrino Oscillations by the T2K experiment with $2.2\times10^{21}$ protons on target

    K. Abe, R. Akutsu, A. Ali, J. Amey, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz, F. Bench, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, N. Dokania, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, P. Fernandez, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, R. Fujita, D. Fukuda, Y. Fukuda, K. Gameil, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, L. Haegel, J. T. Haigh, P. Hamacher-Baumann, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, A. Hiramoto, M. Hogan, J. Holeczek, F. Hosomi, A. K. Ichikawa, M. Ikeda, J. Imber, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, M. Ishitsuka, K. Iwamoto, A. Izmaylov, B. Jamieson, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, Y. Kato, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, P. P. Koller, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, H. Kubo, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, Z. J. Liptak, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, T. Maruyama, T. Matsubara, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, S. Moriyama, J. Morrison, Th. A. Mueller, S. Murphy, Y. Nagai, T. Nakadaira, M. Nakahata, Y. Nakajima, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. Nielsen, K. Niewczas, K. Nishikawa, Y. Nishimura, T. S. Nonnenmacher, P. Novella, J. Nowak, H. M. O'Keeffe, L. O'Sullivan, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, P. Paudyal, M. Pavin, D. Payne, L. Pickering, C. Pidcott, E. S. Pinzon Guerra, C. Pistillo, B. Popov, K. Porwit, M. Posiadala-Zezula, A. Pritchard, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. Rubbia, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, S. Sasaki, E. Scantamburlo, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, Y. Sonoda, J. Steinmann, T. Stewart, P. Stowell, Y. Suda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, A. A. Sztuc, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, T. Thakore, L. F. Thompson, W. Toki, C. Touramanis, K. M. Tsui, T. Tsukamoto, M. Tzanov, Y. Uchida, W. Uno, M. Vagins, Z. Vallari, G. Vasseur, C. Vilela, T. Vladisavljevic, V. V. Volkov, T. Wachala, J. Walker, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, S. Yen, N. Yershov, M. Yokoyama, T. Yoshida, M. Yu, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review Letters 121 (17) 2018/07/20

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevLett.121.171802  

    ISSN: 0031-9007

    eISSN: 1079-7114

    More details Close

    The T2K experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and antineutrino beams. With an exposure of $14.7(7.6)\times 10^{20}$ protons on target in neutrino (antineutrino) mode, 89 $\nu_e$ candidates and 7 anti-$\nu_e$ candidates were observed while 67.5 and 9.0 are expected for $\delta_{CP}=0$ and normal mass ordering. The obtained $2\sigma$ confidence interval for the $CP$ violating phase, $\delta_{CP}$, does not include the $CP$-conserving cases ($\delta_{CP}=0,\pi$). The best-fit values of other parameters are $\sin^2\theta_{23} = 0.526^{+0.032}_{-0.036}$ and $\Delta m^2_{32}=2.463^{+0.071}_{-0.070}\times10^{-3} \mathrm{eV}^2/c^4$.

  42. Hyper-Kamiokande Design Report

    Hyper-Kamiokande Proto-Collaboration, :, K. Abe, Ke. Abe, H. Aihara, A. Aimi, R. Akutsu, C. Andreopoulos, I. Anghel, L. H. V. Anthony, M. Antonova, Y. Ashida, V. Aushev, M. Barbi, G. J. Barker, G. Barr, P. Beltrame, V. Berardi, M. Bergevin, S. Berkman, L. Berns, T. Berry, S. Bhadra, D. Bravo-Berguño, F. d. M. Blaszczyk, A. Blondel, S. Bolognesi, S. B. Boyd, A. Bravar, C. Bronner, M. Buizza Avanzini, F. S. Cafagna, A. Cole, R. Calland, S. Cao, S. L. Cartwright, M. G. Catanesi, C. Checchia, Z. Chen-Wishart, J. H. Choi, K. Choi, J. Coleman, G. Collazuol, G. Cowan, L. Cremonesi, T. Dealtry, G. De Rosa, C. Densham, D. Dewhurst, E. L. Drakopoulou, F. Di Lodovico, O. Drapier, J. Dumarchez, P. Dunne, M. Dziewiecki, S. Emery, A. Esmaili, A. Evangelisti, E. Fernandez-Martinez, T. Feusels, A. Finch, A. Fiorentini, G. Fiorillo, M. Fitton, K. Frankiewicz, M. Friend, Y. Fujii, Y. Fukuda, D. Fukuda, K. Ganezer, C. Giganti, M. Gonin, N. Grant, P. Gumplinger, D. R. Hadley, B. Hartfiel, M. Hartz, Y. Hayato, K. Hayrapetyan, J. Hill, S. Hirota, S. Horiuchi, A. K. Ichikawa, T. Iijima, M. Ikeda, J. Imber, K. Inoue, J. Insler, R. A. Intonti, A. Ioannisian, T. Ishida, H. Ishino, M. Ishitsuka, Y. Itow, K. Iwamoto, A. Izmaylov, B. Jamieson, H. I. Jang, J. S. Jang, S. H. Jeon, M. Jiang, P. Jonsson, K. K. Joo, A. Kaboth, C. Kachulis, T. Kajita, J. Kameda, Y. Kataoka, T. Katori, K. Kayrapetyan, E. Kearns, M. Khabibullin, A. Khotjantsev, J. H. Kim, J. Y. Kim, S. B. Kim, S. Y. Kim, S. King, Y. Kishimoto, T. Kobayashi, M. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Korzenev, K. L. Kowalik, W. R. Kropp, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, L. Labarga, J. Lagoda, P. J. J. Lasorak, M. Laveder, M. Lawe, J. G. Learned, I. T. Lim, T. Lindner, R. P. Litchfield, A. Longhin, P. Loverre, T. Lou, L. Ludovici, W. Ma, L. Magaletti, K. Mahn, M. Malek, L. Maret, C. Mariani, K. Martens, Ll. Marti, J. F. Martin, J. Marzec, S. Matsuno, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, P. Mermod, C. Metelko, M. Mezzetto, J. Migenda, P. Mijakowski, H. Minakata, A. Minamino, S. Mine, O. Mineev, A. Mitra, M. Miura, T. Mochizuki, J. Monroe, D. H. Moon, S. Moriyama, T. Mueller, F. Muheim, K. Murase, F. Muto, M. Nakahata, Y. Nakajima, K. Nakamura, T. Nakaya, S. Nakayama, C. Nantais, M. Needham, T. Nicholls, Y. Nishimura, E. Noah, F. Nova, J. Nowak, H. Nunokawa, Y. Obayashi, H. M. O'Keeffe, Y. Okajima, K. Okumura, Yu. Onishchuk, E. O'Sullivan, L. O'Sullivan, T. Ovsiannikova, R. A. Owen, Y. Oyama, M. Y. Pac, V. Palladino, J. L. Palomino, V. Paolone, W. Parker, S. Parsa, D. Payne, J. D. Perkin, C. Pidcott, E. Pinzon Guerra, S. Playfer, B. Popov, M. Posiadala-Zezula, J. M. Poutissou, A. Pritchard, N. W. Prouse, G. Pronost, P. Przewlocki, B. Quilain, E. Radicioni, P. N. Ratoff, F. Retiere, C. Riccio, B. Richards, E. Rondio, H. J. Rose, C. Rott, S. D. Rountree, A. C. Ruggeri, A. Rychter, R. Sacco, M. Sakuda, M. C. Sanchez, E. Scantamburlo, M. Scott, S. M. Sedgwick, Y. Seiya, T. Sekiguchi, H. Sekiya, S. H. Seo, D. Sgalaberna, R. Shah, A. Shaikhiev, I. Shimizu, M. Shiozawa, Y. Shitov, S. Short, C. Simpson, G. Sinnis, M. B. Smy, S. Snow, J. Sobczyk, H. W. Sobel, Y. Sonoda, R. Spina, T. Stewart, J. L. Stone, Y. Suda, Y. Suwa, Y. Suzuki, A. T. Suzuki, R. Svoboda, M. Taani, R. Tacik, A. Takeda, A. Takenaka, A. Taketa, Y. Takeuchi, V. Takhistov, H. A. Tanaka, H. K. M. Tanaka, H. Tanaka, R. Terri, M. Thiesse, L. F. Thompson, M. Thorpe, S. Tobayama, C. Touramanis, T. Towstego, T. Tsukamoto, K. M. Tsui, M. Tzanov, Y. Uchida, M. R. Vagins, G. Vasseur, C. Vilela, R. B. Vogelaar, J. Walding, J. Walker, M. Ward, D. Wark, M. O. Wascko, A. Weber, R. Wendell, R. J. Wilkes, M. J. Wilking, J. R. Wilson, T. Xin, K. Yamamoto, C. Yanagisawa, T. Yano, S. Yen, N. Yershov, D. N. Yeum, M. Yokoyama, T. Yoshida, I. Yu, M. Yu, J. Zalipska, K. Zaremba, M. Ziembicki, M. Zito, S. Zsoldos

    2018/05/09

    More details Close

    On the strength of a double Nobel prize winning experiment (Super)Kamiokande and an extremely successful long baseline neutrino programme, the third generation Water Cherenkov detector, Hyper-Kamiokande, is being developed by an international collaboration as a leading worldwide experiment based in Japan. The Hyper-Kamiokande detector will be hosted in the Tochibora mine, about 295 km away from the J-PARC proton accelerator research complex in Tokai, Japan. The currently existing accelerator will be steadily upgraded to reach a MW beam by the start of the experiment. A suite of near detectors will be vital to constrain the beam for neutrino oscillation measurements. A new cavern will be excavated at the Tochibora mine to host the detector. The experiment will be the largest underground water Cherenkov detector in the world and will be instrumented with new technology photosensors, faster and with higher quantum efficiency than the ones in Super-Kamiokande. The science that will be developed will be able to shape the future theoretical framework and generations of experiments. Hyper-Kamiokande will be able to measure with the highest precision the leptonic CP violation that could explain the baryon asymmetry in the Universe. The experiment also has a demonstrated excellent capability to search for proton decay, providing a significant improvement in discovery sensitivity over current searches for the proton lifetime. The atmospheric neutrinos will allow to determine the neutrino mass ordering and, together with the beam, able to precisely test the three-flavour neutrino oscillation paradigm and search for new phenomena. A strong astrophysical programme will be carried out at the experiment that will detect supernova neutrinos and will measure precisely solar neutrino oscillation.

  43. Characterisation of nuclear effects in muon-neutrino scattering on hydrocarbon with a measurement of final-state kinematics and correlations in charged-current pionless interactions at T2K

    K. Abe, J. Amey, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, A. Ariga, Y. Ashida, Y. Azuma, S. Ban, M. Barbi, G. J. Barker, G. Barr, C. Barry, M. Batkiewicz, V. Berardi, S. Berkman, R. M. Berner, L. Berns, S. Bhadra, S. Bienstock, A. Blondel, S. Bolognesi, S. Bordoni, B. Bourguille, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, M. Buizza Avanzini, J. Calcutt, T. Campbell, S. Cao, S. L. Cartwright, M. G. Catanesi, A. Cervera, A. Chappell, C. Checchia, D. Cherdack, N. Chikuma, G. Christodoulou, J. Coleman, G. Collazuol, D. Coplowe, A. Cudd, A. Dabrowska, G. De Rosa, T. Dealtry, P. F. Denner, S. R. Dennis, C. Densham, F. Di Lodovico, S. Dolan, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, S. Emery-Schrenk, A. Ereditato, T. Feusels, A. J. Finch, G. A. Fiorentini, G. Fiorillo, C. Francois, M. Friend, Y. Fujii, D. Fukuda, Y. Fukuda, A. Garcia, C. Giganti, F. Gizzarelli, T. Golan, M. Gonin, D. R. Hadley, L. Haegel, J. T. Haigh, P. Hamacher-Baumann, D. Hansen, J. Harada, M. Hartz, T. Hasegawa, N. C. Hastings, T. Hayashino, Y. Hayato, T. Hiraki, A. Hiramoto, S. Hirota, M. Hogan, J. Holeczek, F. Hosomi, A. K. Ichikawa, M. Ikeda, J. Imber, T. Inoue, R. A. Intonti, T. Ishida, T. Ishii, K. Iwamoto, A. Izmaylov, B. Jamieson, M. Jiang, S. Johnson, P. Jonsson, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, D. Karlen, T. Katori, E. Kearns, M. Khabibullin, A. Khotjantsev, H. Kim, J. Kim, S. King, J. Kisiel, A. Knight, A. Knox, T. Kobayashi, L. Koch, T. Koga, P. P. Koller, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, R. Kurjata, T. Kutter, L. Labarga, J. Lagoda, I. Lamont, M. Lamoureux, P. Lasorak, M. Laveder, M. Lawe, M. Licciardi, T. Lindner, Z. J. Liptak, R. P. Litchfield, X. Li, A. Longhin, J. P. Lopez, T. Lou, L. Ludovici, X. Lu, L. Magaletti, K. Mahn, M. Malek, S. Manly, L. Maret, A. D. Marino, J. F. Martin, P. Martins, S. Martynenko, T. Maruyama, V. Matveev, K. Mavrokoridis, W. Y. Ma, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, C. Metelko, M. Mezzetto, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, S. Moriyama, J. Morrison, Th. A. Mueller, Y. Nagai, T. Nakadaira, M. Nakahata, K. G. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakanishi, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nantais, C. Nielsen, K. Niewczas, K. Nishikawa, Y. Nishimura, P. Novella, J. Nowak, H. M. O'Keeffe, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser, T. Ovsyannikova, R. A. Owen, Y. Oyama, V. Palladino, J. L. Palomino, V. Paolone, P. Paudyal, M. Pavin, D. Payne, Y. Petrov, L. Pickering, E. S. Pinzon Guerra, C. Pistillo, B. Popov, M. Posiadala-Zezula, A. Pritchard, P. Przewlocki, B. Quilain, T. Radermacher, E. Radicioni, P. N. Ratoff, M. A. Rayner, E. Reinherz-Aronis, C. Riccio, E. Rondio, B. Rossi, S. Roth, A. C. Ruggeri, A. Rychter, K. Sakashita, F. Sánchez, S. Sasaki, E. Scantamburlo, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, R. Shah, A. Shaikhiev, F. Shaker, D. Shaw, M. Shiozawa, A. Smirnov, M. Smy, J. T. Sobczyk, H. Sobel, J. Steinmann, T. Stewart, P. Stowell, Y. Suda, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, R. Tacik, M. Tada, A. Takeda, Y. Takeuchi, R. Tamura, H. K. Tanaka, H. A. Tanaka, T. Thakore, L. F. Thompson, W. Toki, T. Tsukamoto, M. Tzanov, W. Uno, M. Vagins, Z. Vallari, G. Vasseur, C. Vilela, T. Vladisavljevic, T. Wachala, J. Walker, C. W. Walter, Y. Wang, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, R. J. Wilson, C. Wret, Y. Yamada, K. Yamamoto, S. Yamasu, C. Yanagisawa, T. Yano, S. Yen, N. Yershov, M. Yokoyama, M. Yu, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos, A. Zykova

    Physical Review D 98 (3) 2018/02/14

    Publisher: American Physical Society (APS)

    DOI: 10.1103/PhysRevD.98.032003  

    ISSN: 2470-0010

    eISSN: 2470-0029

    More details Close

    This paper reports measurements of final-state proton multiplicity, muon and proton kinematics, and their correlations in charged-current pionless neutrino interactions, measured by the T2K ND280 near detector in its plastic scintillator (C$_8$H$_8$) target. The data were taken between years 2010 and 2013, corresponding to approximately 6$\times10^{20}$ protons on target. Thanks to their exploration of the proton kinematics and of kinematic imbalances between the proton and muon kinematics, the results offer a novel probe of the nuclear-medium effects most pertinent to the (sub-)GeV neutrino-nucleus interactions that are used in accelerator-based long-baseline neutrino oscillation measurements. These results are compared to many neutrino-nucleus interaction models which all fail to describe at least part of the observed phase space. In case of events without a proton above a detection threshold in the final state, a fully consistent implementation of the local Fermi gas model with multinucleon interactions gives the best description of the data. In the case of at least one proton in the final state the spectral function model agrees well with the data, most notably when measuring the kinematic imbalance between the muon and the proton in the plane transverse to the incoming neutrino. A clear indication of existence of multinucleon interactions is observed. The effect of final-state interactions is also discussed.

  44. Systematic uncertainties for T2K neutrino flux tuning with 2010 NA61/SHINE data.

    Berns L., Fiorentini A., Hartz M., Kuze M., Vladisavljevic T., T2K Collaboration

    Meeting Abstracts of the Physical Society of Japan 73 (0) 105-105 2018

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.73.1.0_105  

  45. Systematic uncertainties of the T2K neutrino beam flux for upcoming upgrades to the neutrino horn and beam Monte Carlo simulation.

    Berns L., Fiorentini A., Hartz M., Kuze M., Vladisavljevic T., T2K Collaboration

    Meeting Abstracts of the Physical Society of Japan 73 (0) 107-107 2018

    Publisher: The Physical Society of Japan

    DOI: 10.11316/jpsgaiyo.73.2.0_107  

  46. Physics Potentials with the Second Hyper-Kamiokande Detector in Korea

    Hyper-Kamiokande proto-collaboration, :, K. Abe, Ke. Abe, S. H. Ahn, H. Aihara, A. Aimi, R. Akutsu, C. Andreopoulos, I. Anghel, L. H. V. Anthony, M. Antonova, Y. Ashida, V. Aushev, M. Barbi, G. J. Barker, G. Barr, P. Beltrame, V. Berardi, M. Bergevin, S. Berkman, L. Berns, T. Berry, S. Bhadra, D. Bravo-Bergu no, F. d. M. Blaszczyk, A. Blondel, S. Bolognesi, S. B. Boyd, A. Bravar, C. Bronner, M. Buizza Avanzini, F. S. Cafagna, B. G. Cheon, M. K. Cheoun, K. Cho, K. Y. Choi, E. J. Chun, A. Cole, R. Calland, S. Cao, S. L. Cartwright, M. G. Catanesi, C. Checchia, Z. Chen-Wishart, J. H. Choi, K. Choi, J. Coleman, G. Collazuol, G. Cowan, L. Cremonesi, T. Dealtry, G. De Rosa, C. Densham, D. Dewhurst, E. L. Drakopoulou, F. Di Lodovico, O. Drapier, J. Dumarchez, P. Dunne, M. Dziewiecki, S. Emery, A. Esmaili, A. Evangelisti, E. Fernandez-Martinez, T. Feusels, A. Finch, G. A. Fiorentini, G. Fiorillo, M. Fitton, K. Frankiewicz, M. Friend, Y. Fujii, Y. Fukuda, D. Fukuda, K. Ganezer, M. Ghosh, C. Giganti, M. Gonin, N. Grant, P. Gumplinger, D. R. Hadley, B. Hartfiel, M. Hartz, Y. Hayato, K. Hayrapetyan, J. Hill, S. Hirota, S. Horiuchi, A. K. Ichikawa, T. Iijima, M. Ikeda, J. Imber, K. Inoue, J. Insler, R. A. Intonti, A. Ioannisian, T. Ishida, H. Ishino, M. Ishitsuka, Y. Itow, K. Iwamoto, A. Izmaylov, B. Jamieson, H. I. Jang, J. S. Jang, S. H. Jeon, K. S. Jeong, M. Jiang, P. Jonsson, K. K. Joo, A. Kaboth, C. Kachulis, T. Kajita, S. K. Kang, J. Kameda, Y. Kataoka, T. Katori, K. Kayrapetyan, E. Kearns, M. Khabibullin, A. Khotjantsev, C. S. Kim, H. B. Kim, H. J. Kim, J. H. Kim, J. -S. Kim, J. Y. Kim, S. B. Kim, S. C. Kim, S. -W. Kim, S. Y. Kim, S. King, T. J. Kim, W. Kim, Y. Kishimoto, P. Ko, T. Kobayashi, M. Koga, A. Konaka, L. L. Kormos, Y. Koshio, A. Korzenev, K. L. Kowalik, W. R. Kropp, Y. Kudenko, R. Kurjata, T. Kutter, M. Kuze, K. Kwak, E. H. Kwon, L. Labarga, J. Lagoda, P. J. J. Lasorak, M. Laveder, M. Lawe, J. G. Learned, C. H. Lee, S. J. Lee, W. J. Lee, I. T. Lim, T. Lindner, R. P. Litchfield, A. Longhin, P. Loverre, T. Lou, L. Ludovici, W. Ma, L. Magaletti, K. Mahn, M. Malek, L. Maret, C. Mariani, K. Martens, Ll. Marti, J. F. Martin, J. Marzec, S. Matsuno, E. Mazzucato, M. McCarthy, N. McCauley, K. S. McFarland, C. McGrew, A. Mefodiev, P. Mermod, C. Metelko, M. Mezzetto, J. Migenda, P. Mijakowski, H. Minakata, A. Minamino, S. Mine, O. Mineev, A. Mitra, M. Miura, T. Mochizuki, J. Monroe, C. S. Moon, D. H. Moon, S. Moriyama, T. Mueller, F. Muheim, K. Murase, F. Muto, M. Nakahata, Y. Nakajima, K. Nakamura, T. Nakaya, S. Nakayama, C. Nantais, M. Needham, T. Nicholls, Y. Nishimura, E. Noah, F. Nova, J. Nowak, H. Nunokawa, Y. Obayashi, Y. D. Oh, Y. Oh, H. M. O'Keeffe, Y. Okajima, K. Okumura, Yu. Onishchuk, E. O'Sullivan, L. O'Sullivan, T. Ovsiannikova, R. A. Owen, Y. Oyama, M. Y. Pac, V. Palladino, J. L. Palomino, V. Paolone, H. S. Park, J. C. Park, M. G. Park, S. C. Park, W. Parker, S. Parsa, D. Payne, J. D. Perkin, C. Pidcott, E. Pinzon Guerra, S. Playfer, B. Popov, M. Posiadala-Zezula, J. -M. Poutissou, A. Pritchard, N. W. Prouse, G. Pronost, P. Przewlocki, B. Quilain, M. Quinto, E. Radicioni, P. N. Ratoff, F. Retiere, C. Riccio, B. Richards, E. Rondio, H. J. Rose, C. Rott, S. D. Rountree, A. C. Ruggeri, A. Rychter, D. Ryu, R. Sacco, M. Sakuda, M. C. Sanchez, E. Scantamburlo, M. Scott, S. Molina Sedgwick, Y. Seiya, T. Sekiguchi, H. Sekiya, H. Seo, S. H. Seo, D. Sgalaberna, R. Shah, A. Shaikhiev, I. Shimizu, M. Shiozawa, Y. Shitov, S. Short, C. Simpson, G. Sinnis, M. B. Smy, S. Snow, J. Sobczyk, H. W. Sobel, D. C. Son, Y. Sonoda, R. Spina, T. Stewart, J. L. Stone, Y. Suda, Y. Suwa, Y. Suzuki, A. T. Suzuki, R. Svoboda, M. Taani, R. Tacik, A. Takeda, A. Takenaka, A. Taketa, Y. Takeuchi, V. Takhistov, H. A. Tanaka, H. K. M. Tanaka, H. Tanaka, R. Terri, M. Thiesse, L. F. Thompson, M. Thorpe, S. Tobayama, C. Touramanis, T. Towstego, T. Tsukamoto, K. M. Tsui, M. Tzanov, Y. Uchida, M. R. Vagins, G. Vasseur, C. Vilela, R. B. Vogelaar, J. Walding, J. Walker, M. Ward, D. Wark, M. O. Wascko, A. Weber, R. Wendell, R. J. Wilkes, M. J. Wilking, J. R. Wilson, E. Won, T. Xin, K. Yamamoto, C. Yanagisawa, T. Yano, O. Yasuda, S. Yen, N. Yershov, D. N. Yeum, M. Yokoyama, H. D. Yoo, J. Yoo, S. C. Yoon, T. S. Yoon, T. Yoshida, I. Yu, M. Yu, J. Zalipska, K. Zaremba, M. Ziembicki, M. Zito, S. Zsoldos

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2018 (6) 2016/11/18

    DOI: 10.1093/ptep/pty044  

    ISSN: 2050-3911

Show all ︎Show first 5

Misc. 2

  1. Status of full operation of a new T2K near detector SuperFGD

    谷川輝, 松原綱之, 坂下健, 中平武, 藤井芳昭, 小林隆, JAKKAPU Mahesh, JAKKAPU Mahesh, 有元隼太, 川上将輝, HU Jianrun, 木河達也, 中家剛, 市川温子, BERNS Lukas, 吉本芳美, 児玉将馬, 冲永和平, 小林北斗, 新居智将, FERLEWICZ Daniel, 中桐洸太, 横山将志, 安部清尚, 角野秀一, 南野彰宏

    日本物理学会講演概要集(CD-ROM) 79 (2) 2024

    ISSN: 2189-079X

  2. Commissioning of a new T2K near detector SuperFGD

    谷川輝, 松原綱之, 坂下健, 中平武, 藤井芳昭, 小林隆, JAKKAPU Mahesh, JAKKAPU Mahesh, 川上将輝, 對馬拓実, 有元隼太, HU Jianrun, 木河達也, 中家剛, 市川温子, BERNS Lukas, 江口碧, 吉本芳美, 児玉将馬, 冲永和平, 小林北斗, 中桐洸太, 横山将志, 在原拓司, 古井佑典, 角野秀一, 南野彰宏

    日本物理学会講演概要集(CD-ROM) 78 (2) 2023

    ISSN: 2189-079X

Presentations 37

  1. Neutrino oscillation experiments (Reactor, atmosphere, long baseline) International-presentation Invited

    Lukas Berns

    The XIX International Conference on Topics in Astroparticle and Underground Physics (TAUP2025) 2025/08/25

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    I will review the current status of reactor, atmospheric, and long-baseline accelerator neutrino oscillation experiments, with a focus on the parameter constraints within the three-flavor oscillation framework. Thanks to a wide range of experiments, we now have increasingly precise neutrino oscillation measurements across a broad spectrum of energies and baselines. This is significant for two reasons. First, the consistency of results across experiments — despite differences in detector technologies, neutrino sources, and interaction channels — demonstrates successful control over systematic uncertainties at current statistics. Second, while individual experiments only probe specific projections of the oscillation parameter space, leading to various degeneracies in parameter inference, the combination of results from multiple experiments helps to both lift some of these degeneracies and test the validity of the three-flavor oscillation framework. Future prospects and remaining challenges will also be discussed.

  2. First joint analysis of Super-Kamiokande atmospheric and T2K accelerator neutrino data International-presentation International-coauthorship

    Lukas Berns, Zhenxiong Xie

    XXXI International Conference on Neutrino Physics and Astrophysics (Neutrino 2024) 2024/06/18

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    This poster presents new results from the first joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (Super-K) and accelerator neutrinos at Tokai-to-Kamioka (T2K). Leveraging Super-K atmospheric neutrinos, which are sensitive to mass ordering, and T2K accelerator neutrinos, which are sensitive to the CP violation phase, the joint analysis is able to improve sensitivity by resolving degeneracies between these parameters. This poster presents frequentist and Bayesian results for the neutrino mass ordering, CP violation phase, as well as other mixing parameters. For the test of CP-conservation, a dedicated p-value is introduced with improved statistical properties compared to what can be obtained using confidence intervals on the CP-violation phase. An analysis of the statistical consistency between Super-K and T2K is performed under the common systematic uncertainty model which incorporates correlations between the two experiments. The potential of future joint fits is finally studied using the expected sensitivities on oscillation parameters.

  3. First results from the joint oscillation analysis between SK atmospheric neutrinos and T2K accelerator neutrinos International-coauthorship Invited

    Lukas Berns

    KEK/J-PARC Seminar: IPNS Physics and Detector Seminars 2023/12/20

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    The T2K experiment studies the oscillations of a high-power muon neutrino beam generated at J-PARC and measured at the Super-Kamiokande (SK) detector 295 km away. Many results have been presented using data collected until 2020, including world first indications of leptonic CP violation. The experiment is entering a new phase toward the discovery of CP violation with upgraded accelerator and beam line for higher power, an upgraded near detector for better flux and interaction constraints and enhanced sensitivity at the SK detector. In parallel, the T2K and SK collaborations have been developing a new joint analysis of accelerator and atmospheric neutrino data for more precise constraints on neutrino oscillation parameters. Because of differences in neutrino energies and oscillation baselines, a joint analysis can break degeneracies between oscillation parameters present in the individual analyses and is expected to improve the sensitivities beyond simple increase in statistics. Here we present a new result from a joint analysis of T2K data collected until 2020 and SK-IV data, using a specifically developed systematic uncertainty model that includes correlations between the two experimental datasets.

  4. T2K results on long-baseline oscillations International-presentation International-coauthorship Invited

    L. Berns, T2K Collaboration

    Neutrino Oscillation Workshop 2022 2022/09/05

  5. Efficient statistics for future neutrino oscillation experiments Invited

    Lukas Berns

    International School of Subnuclear Physics 2022 2022/06/19

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    Long-baseline neutrino oscillation experiments are on the hunt for discovering CP violation in the leptonic sector, parameterized by the violation angle δCP. In the past few years, T2K has started to exclude regions of the δCP parameter space at 3σ confidence level. As the HyperK and DUNE experiments have started construction, we will try to address challenges in the frequentist analysis toward the discovery threshold of 5σ aimed by these next generation experiments. In particular, the cyclic nature of δCP, interweaved with degeneracies of neutrino mass ordering and atmospheric mixing angle octant, demands computationally expensive procedures like the Feldman-Cousins method for constructing confidence intervals with proper coverage. Naively extending the current calculation would require fitting more than a billion toy experiments to obtain critical value distributions for the construction of 5σ confidence intervals, which is computationally very challenging given the complexity of the analysis. We propose one of several new techniques to significantly increase the computational efficiency for obtaining the intervals. The presented technique addresses the sheer large number of toy experiments to be fitted. We propose a simple method to specifically generate toy experiments that yield small p-values (large Δχ2 values). The necessary number of toy experiments to be fitted is shown to reduce exponentially for larger Δχ2 values (about 30x faster for 3σ, 2000x for 5σ). In addition, the method provides an interpolation of critical value distributions between the true parameter values for which the toy experiments were generated. While being developed in the context of neutrino oscillation analysis, the methods are expected to be applicable to a wide range of experiments that use the Feldman Cousins method for constructing confidence intervals.

  6. ニュートリノ Invited

    Lukas Berns

    第10回高エネルギー物理春の学校 2022/05/28

  7. T2K Experiment International-coauthorship Invited

    Lukas Berns, T2K collaboration

    JPS 2022 Spring, Japan-Korea Joint Symposium for Experimental Particle Physics 2022/03/18

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    The Tokai-to-Kamioka (T2K) experiment is a long-baseline neutrino experiment studying the oscillations of a muon neutrino beam produced at the J-PARC accelerator detected 295 km away at the Super-Kamiokande (SK) detector. The disappearance of muon neutrinos allows precise study of the atmospheric oscillation parameters \theta_{23} and \Delta m_{32}^2, whereas the appearance of electron neutrinos is sensitive to the reactor angle \theta_{13} and \theta_{23}-octant. The polarity of the magnetic horns focusing the beam can be changed to separately study muon neutrino and antineutrino oscillations, which, when combined with the strong constraint on \theta_{13} from reactor experiments, give the most precise constraints on the leptonic CP violation phase \delta_{\mathrm{CP } } and also some sensitivity to neutrino mass ordering. In addition to the 33% increase in neutrino mode data at SK, numerous updates to the flux, interaction model, and near detector constraint further improved the analysis model resulting in smaller systematic uncertainties. The robustness of these analysis model choices is validated using simulated data studies. We report on the latest oscillation results, presented at Neutrino 2020, excluding a large range of the \delta_{\mathrm{CP } } parameter space at 3\sigma confidence level with weak preference for normal ordering and upper \theta_{23}-octant. The measurement of these parameters has implications in the context of explaining the observed matter/anti-matter asymmetry of the universe, neutrino-less double-beta decay searches, and flavor symmetries. We also give an overview of further refinements toward the upcoming oscillation analysis, ongoing joint fits with other experiments, and discuss future prospects of beam line and detector upgrades.

  8. Global analysis of pion scattering data for neutrino oscillation experiments

    Lukas Berns, T2K Collaboration

    JPS 2025 Spring Meeting 2025/03/20

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    Long-baseline neutrino oscillation experiments rely on neutrino-nucleus scattering to search for physics such as leptonic CP violation. In the T2K experiment, since quasi-elastic scattering is used as the main signal, it is important to isolate single-pion-production background events, which result in different kinematics. Since pions produced in the neutrino interaction can evade detection through scattering and absorption in the mother nuclei or other nuclei, the pion interaction cross-section in the few 100 MeV/c region is an important theoretical uncertainty. Previous analyses used world pion scattering data to extract this cross-section, but suffered from underestimated fitting errors, requiring manual inflation of errors to obtain usable results. In this talk, we revise both the analysis model and statistical methods to obtain more reliable fit results and errors that do not require manual intervention.

  9. Statistical aspects of testing for CP conservation in neutrino oscillations International-coauthorship

    Lukas Berns

    JPS 2024 Spring Meeting 2024/03/19

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    The constraint on leptonic CP violation from neutrino oscillation experiments is gradually becoming stronger. The statistical analysis is typically performed using confidence intervals on the CP violation angle and neutrino mass ordering. We examined the statistical properties of statements on CP violation based on these confidence intervals and found a loss of statistical power due to degeneracies with discrete parameters like the neutrino mass ordering. We show non-trivial effects such as a loss of power when combining more experimental data with the example of a joint analysis between atmospheric and accelerator neutrinos and present a test with better statistical properties.

  10. Frequentist properties of the joint analysis of atmospheric and accelerator neutrinos International-coauthorship

    Lukas Berns, Christophe Bronner, Mathieu Guigue, Aoi Eguchi, Megan Friend, Jianrun Hu, Roger Wendell, Junjie Xia, Super-Kamiokande Collaboration, T2K Collaboration

    JPS 2023 Fall Meeting 2023/09/16

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    A joint oscillation analysis of atmospheric neutrinos measured by Super Kamiokande and accelerator neutrinos measured by T2K is in preparation. Atmospheric neutrinos have sensitivity to neutrino mass ordering via matter effects in the earth, whereas T2K has stronger sensitivity to the CP violation angle thanks to selective beam composition. A joint fit is expected to provide mutual benefits via resolution of degeneracies between these parameters and systematic parameter constraints. We developed a fast approximate analysis for the SK+T2K joint fit in order to conduct frequentist analyses by fitting a large number of pseudo-experiments and study the frequentist properties. We report on consistency checks between the experiments, tests for the mass ordering, and Feldman-Cousins confidence interval construction for the CP violation angle.

  11. Constraints on CP violation and neutrino mass ordering with a joint analysis of accelerator and atmospheric neutrino oscillations Invited

    Lukas Berns

    JPS 2023 Spring Meeting 2023/03/24

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    Neutrino oscillations have not only revealed that neutrinos have mass, but also led to the interesting possibility that their masses could be of different origin than the other fermions and related to the matter anti-matter asymmetry of the universe. To constrain two related oscillation parameters, the leptonic CP violation phase and mass ordering, a joint fit of accelerator neutrino and atmospheric neutrino oscillation data from the T2K and Super-Kamiokande experiments has been performed. While atmospheric neutrinos are sensitive to the mass ordering through matter effects inside the Earth, accelerator neutrinos are sensitive to the CP violation phase through selective operation mode of the high-purity muon neutrino beam. The synergy of a joint fit lies in the resolution of degeneracies between the parameters as well as improved constraints on systematic uncertainties. This thesis develops for the joint fit an extended neutrino interaction model, new oscillation probability calculation methods, as well as various advanced statistical analysis techniques. Upon investigation of the expected gain in sensitivity, the consistency of the two data sets is checked and improved constraints on the oscillation parameters are obtained.

  12. Proposal of computationally efficient statistical analysis for future neutrino oscillation experiments

    Lukas Berns

    JPS 2023 Spring Meeting 2023/03/23

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    Long-baseline neutrino oscillation experiments are on the hunt for discovering CP violation in the leptonic sector. As the HyperK and DUNE experiments have started construction, we will try to address challenges in the frequentist analysis toward the discovery threshold of 5𝜎 aimed by these next generation experiments. The cyclic nature of the CP violation angle δ!" , interweaved with degeneracies between other oscillation parameters, demands computationally expensive procedures like the Feldman-Cousins method for constructing confidence intervals with proper coverage. Where the current calculation would require fitting more than a billion toy experiments, we propose a new technique to significantly reduce this count and make the analysis computationally feasible.

  13. T2K実験における新型前置検出器SuperFGDのためのDAQ開発

    Lukas Berns

    計測システム研究会 2022/11/17

  14. ニュートリノ(実験) International-coauthorship Invited

    Lukas Berns

    Flavor Physics workshop 2022 2022/11/09

  15. Atmospheric oscillation probability calculation for the SK+T2K joint oscillation analysis

    L. Berns, D. Barrow, R. Wendell, C. Wret

    The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022) 2022/06/01

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    A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. The atmospheric oscillation probability calculation is one of the most time-consuming parts of the fit and demands precision due to direct impact on oscillation parameter constraints. As an alternative to the existing method of pre-computing probabilities for a large number of simulated events, we develop new methods that allow real-time calculation with continuous values of oscillation parameters. Special techniques are introduced to average over fast oscillations at low energies. Furthermore, the density profile along the trajectory can significantly affect the oscillation probabilities of neutrinos crossing the Earth, which allows the study of neutrino mass ordering. We study the impact of the Earth model and improved approximations for the matter effect calculation. These results are not only useful in the analysis of SK atmospheric data, but are directly applicable to current and future experiments measuring atmospheric neutrino oscillations, such as IceCube, Hyper-Kamiokande, and DUNE.

  16. Sensitivity studies for the joint analysis of SK atmospheric and T2K accelerator neutrino oscillations International-presentation International-coauthorship

    D. Barrow, L. Berns, A. Blanchet, C. Bronner, M. Guigue, J. Hu, J. Jiang, W. Shi, M. Wilking, R. Wendell, C. Wret, J. Xia, Z. Xie

    The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022) 2022/06/01

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    A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. SK atmospheric neutrinos have sensitivity to neutrino mass ordering via matter effects in the Earth, whereas accelerator neutrinos have stronger sensitivity to the CP violation phase thanks to selective beam operation and low νe background. A joint fit is expected to provide mutual benefits via the resolution of degeneracies between these parameters and systematic parameter constraints. Here we present studies of the expected sensitivity to oscillation parameters, demonstrating the complementarity of oscillation parameter constraints from each experiment, and analyze the impact of T2K near detector constraints on the SK atmospheric fit. [Details of the systematics model and calculation methods are presented in two separate posters.]

  17. Developing joint interaction and detector systematics for the SK+T2K joint oscillation analysis International-presentation International-coauthorship

    D. Barrow*, L. Berns, A. Blanchet, C. Bronner, M. Friend, M. Jia, R. Wendell, M. Wilking, C. Wret, J.Xia

    The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022) 2022/06/01

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    A joint oscillation analysis of atmospheric neutrinos at Super-Kamiokande (SK) and accelerator neutrinos at Tokai-to-Kamioka (T2K) is in preparation. Apart from the increase in statistics and the lifting of degeneracies providing improved constraints on oscillation parameters, the systematics in T2K and SK’s analyses share many common features and have been carefully studied for the joint analysis. SK is also T2K’s far detector, and a natural correlation between detector systematics exists. Two approaches have been developed; one studying the official inputs to each analysis and evaluating their correlations, and the other simultaneously fitting the underlying observables in the oscillation analysis. A sizeable fraction of SK’s “sub-GeV” events share phase space with T2K’s narrow-band beam. A joint neutrino interaction model has been developed, which allows reducing uncertainties on SK’s “sub-GeV” selections further by using high-statistics data collected at T2K’s near detector, ND280. Additional systematics are introduced to account for phase space not covered by ND280. This poster presents on these new developments and their utility in the joint analysis.

  18. A new pion momentum systematic uncertainty and goodness-of-fit studies for joint analysis of atmospheric and accelerator neutrinos International-coauthorship

    Lukas Berns, Christophe Bronner, Mathieu Guigue, Masahiro Kuze, Benjamin Quilain, Roger Wendell, Clarence Wret, Junjie Xia, Super-Kamiokande Collaboration, T2K Collaboration

    JPS 2022 Spring 2022/03/17

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    A joint oscillation analysis of atmospheric neutrinos measured by Super Kamiokande and accelerator neutrinos measured by T2K is in preparation. Atmospheric neutrinos have sensitivity to neutrino mass ordering via matter effects in the earth, whereas T2K has stronger sensitivity to the CP violation angle thanks to selective beam composition. A joint fit is expected to provide mutual benefits via resolution of degeneracies between these parameters and systematic parameter constraints. To reliably apply the neutrino interaction model constraints from the T2K near detector to the atmospheric samples, we develop a new systematic degree of freedom for the pion momentum and study the compatibility of individual data sets within the analysis model.

  19. A new pion momentum systematic uncertainty and goodness-of-fit studies for joint analysis of atmospheric and accelerator neutrinos International-coauthorship

    Lukas Berns, T2K Collaboration, Super-Kamiokande Collaboration

    “Exploration of Particle Physics and Cosmology with Neutrino” Workshop 2022/03/08

  20. Event reconstruction performance with new retro-reflector based designs for water Cherenkov detectors

    Lukas Berns, Shunsuke Fujigami, Yohei Yamaguchi, Masahiro Kuze

    JPS 2021 Autumn 2021/09/16

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    We have proposed the possibility of a cost-efficient way to improve the detector performance for water Cherenkov detectors, by reflecting the usually lost light falling between photo-detectors onto the other side of the tank with retro-reflectors. Using a detector simulation based on optical measurements of retro-reflectors, we developed a convolutional neural network based reconstruction algorithm. Here we report on the reconstruction performance for ring events in the energy scale expected for atmospheric and accelerator neutrinos under various candidate detector configurations.

  21. Development of neutrino oscillation probability calculation for joint analysis of atmospheric and accelerator neutrinos International-coauthorship

    Lukas Berns, Christophe Bronner, Mathieu Guigue, Masahiro Kuze, Benjamin Quilain, Roger Wendell, Junjie Xia, Super-Kamiokande Collaboration, T2K Collaboration

    JPS 2021 Autumn 2021/09/14

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    A joint oscillation analysis of atmospheric neutrinos measured by Super Kamiokande and accelerator neutrinos measured by T2K is in preparation. Atmospheric neutrinos have sensitivity to neutrino mass ordering via matter effects in the earth, whereas T2K has stronger sensitivity to the CP violation angle thanks to selective beam composition. A joint fit is expected to provide mutual benefits via resolution of degeneracies between these parameters and systematic parameter constraints. Here we report on recent developments of neutrino oscillation probability calculation inside the earth, such as averaging of fast oscillations, as well as approximations of the earth shell structure.

  22. Event reconstruction performance with new retro-reflector based designs for water Cherenkov detectors International-presentation

    Lukas Berns, Shunsuke Fujigami, Masahiro Kuze, Yohei Yamaguchi

    17th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2021) 2021/09/01

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    We have proposed the possibility of a cost-efficient way to improve the detector performance for water Cherenkov detectors, by reflecting the usually lost light falling between photo-detectors onto the other side of the tank with retro-reflectors. Using a detector simulation based on optical measurements of retro-reflectors, we developed a convolutional neural network based reconstruction algorithm. Here we report on the reconstruction performance for ring events in the energy scale expected for atmospheric and accelerator neutrinos under various candidate detector configurations.

  23. 大気・加速器ニュートリノ同時解析に向けた ニュートリノ振動確率計算法の開発

    Lukas Berns

    新学術領域「ニュートリノで拓く素粒子と宇宙」オンライン若手研究会 2021/07/30

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    スーパカミオカンデ実験の大気ニュートリノ観測とT2K実験の加速器ニュートリノ観測を用いた同時振動解析が進められている。大気ニュートリノは地球中心での物質効果からニュートリノ質量階層性に感度がある一方、加速器ニュートリノはビーム組成の切り替えによりCP破れ角に対してより感度を持つ。これらのパラメータ間にある縮退の解消や各種系統誤差の制限という相乗効果が同時解析より得られると期待されている。ここでは速い振動の平均化や地球の殻構造の近似方法など、大気ニュートリノ振動確率の計算法の開発について報告する。

  24. T2K neutrino beam flux prediction with improved MC tuning using latest NA61/SHINE hadron production data

    Lukas Berns, T2K Collaboration

    28th International Workshop on Weak Interactions and Neutrinos (WIN 2021) 2021/06/08

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    The neutrino flux is an essential input for oscillation analyses and neutrino cross section measurements in the T2K experiment. To predict the flux, we simulate the production of pions from the primary proton beam and their focusing inside magnetic horns, until they subsequently decay in flight to produce neutrinos. For hadronic interactions, dedicated hadron production data from NA61/SHINE experiment are used to tune the MC prediction and assign systematic uncertainties. We report on recent developments and future prospects for further reduction of systematic uncertainties.

  25. Recent results from T2K Invited

    Lukas Berns, T2K Collaboration

    Rencontres de Moriond 2021: Electroweak Interactions & Unified Theories (Moriond EW 2021) 2021/03/24

  26. Additional studies for the latest T2K neutrino oscillation analysis International-coauthorship

    2021/03/14

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    In 2020, the T2K experiment released its latest constraints on the 3-flavor neutrino oscillation parameters including leptonic CP violation phase using data up to spring 2020. In this talk, we present various studies to refine our understanding of these results. These include each neutrino sample’s contribution to the overall constraint, coverage studies for frequentist intervals and contours, as well as robustness studies against additional uncertainties on the neutrino interaction model.

  27. Uncertainties on the neutrino beam flux for Hyper-Kamiokande due to the direction of the planned detector site International-coauthorship

    2020/09/17

  28. Machine Learning based reconstruction for Hyper Kamiokande

    Lukas Berns, Hyper-Kamiokande collaboration

    Neutrino Physics and Machine Learning workshop 2020/07/24

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    We present initial developments of ML based event reconstruction for water Cherenkov detectors in the context of Hyper Kamiokande. Using ML, we aim to exploit additional spatial and directional information from higher granularity PMTs developed for HyperK to improve on existing reconstruction performance and to enable new measurements that are very challenging in conventional maximum-likelihood fitters. Here, we present several ongoing works, using standard CNN, a new CNN architecture, and other types of networks to efficiently handle topology and geometry of cylindrical detectors. Applications of these networks to particle identification are presented, including electron / gamma separation at higher energies and neutron capture / radioactive decay separation at lower energies. We also present our future plans for additional applications, including generative networks with unsupervised and semi-supervised approaches.

  29. Improving water-Cherenkov detector performance using retro-reflectors and Cherenkov profile variations

    2020/03/16

  30. A new CNN architecture for sub-manifolds embedded into higher dimensional space

    Lukas Berns

    Deep Learning and Physics 2019 2019/11/01

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    We study methods to overcome practical challenges in applying CNNs to water Cherenkov detectors like Super-Kamiokande. Here a huge volume of water is surrounded by light detectors, which record the hit position and timing of photons emitted from relativistic particles inside the tank. The task is particle ID and reconstruction of track parameters like energy or interaction vertex. We propose a way to apply a CNN to the 2D sub-manifold formed by the light detectors, that correctly takes into account the S_2 topology, as well as the reparametrization invariance of the sub-manifold coordinates. In our formulation the integration kernels have a geometrical interpretation, which can be utilized to enlarge the intrinsic translation symmetry in 3D space by rotational symmetry. These features make the network robust against overtraining, suggesting the possibility for data-driven training at the small sample sizes of neutrino events.

  31. Neutrino flux prediction in the T2K experiment

    Lukas Berns, T2K Collaboration

    11th International Workshop on Neutrino Beams and Instrumentation (NBI2019) 2019/10/20

  32. T2Kニュートリノビームの系統誤差削減に向けたMCチューニング法の開発と整合性の評価

    Lukas Berns, Arturo Fiorentini, Megan Friend, Mark Hartz, 久世正弘, Tomislav Vladisavljevic, 坂下健, T2K Collaboration

    日本物理学会 2019年秋季大会 2019/09/19

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    T2K実験ではレプトンCP対称性の破れの3σ観測に向け、様々な系統誤差の削減を目指している。ニュートリノ・ビームのフラックスは炭素標的内でのハドロン相互作用による誤差の寄与が大きいが、CERN NA61/SHINE実験の最新データを使った新しいMCチューニング法により、現在10%程の誤差から5%以下までの削減が見込まれている。本講演では新手法の導入に向けた開発の現状と、各手法の整合性について報告する。

  33. New ideas for ring formation and reconstruction in water Cherenkov detectors

    Lukas Berns

    TAUP 2019 2019/09/10

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    Water Cherenkov detector technology is well established as is easily seen in the almost identical designs of Kamiokande, Super- and Hyper-Kamiokande. We explore methods to further improve upon their success by extracting directional information from originally lost photons using reflectors placed in the inactive space between PMTs. The reflected photons form a secondary antipodal ring, sensitive to the vertex position and track topology. We further show how ring reconstruction algorithms can benefit from modeling variations of the Cherenkov profile due to showering. Monte Carlo based quantitative estimates are accompanied by discussions of strategies to overcome potential issues with the presented methods.

  34. Systematic Uncertainties of the T2K neutrino beam flux with improved MC tuning using NA61/SHINE replica target data

    Lukas Berns for T2K Collaboration

    新学術領域「ニュートリノで拓く素粒子と宇宙」研究会2019 2019/06/13

  35. 再帰反射材によって反射光リングを発生させる 水チェレンコフ検出器の新提案

    Lukas Berns, 久世 正弘

    日本物理学会 2018年秋季大会 2018/09/16

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    純水内で発生したチェレンコフ光をタンクの壁にしきつめられた光電子増倍管で捉え、光量と時間情報から粒子の物理量を再構成するという手法はカミオカンデの時代に確立し、現在まで引き続き用いられている。今回光電子増倍管の間に再帰反射材を配置し、反射光によってもう一つのリングを生成させる新手法を提案する。この反射光のリングは、荷電粒子の生成点や進行方向のうち、直接光が強い感度を持たない成分に対して強い感度を持ち、粒子再構成の精度を大幅に向上させることができると思われる。ここではシミュレーションを用いた再構成精度の評価について報告する。

  36. Systematic uncertainties of the T2K neutrino beam flux for upcoming upgrades to the neutrino horn and beam Monte Carlo simulation International-coauthorship

    2018/09/16

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    The T2K experiment aims at observing leptonic CP violation, and demands in addition to an increase of statistics a reduction of various systematic uncertainties. The electromagnetic horns focusing the neutrino parents are currently running at 250 kA, and are planned to receive an upgrade to the design value of 320 kA. This is expected to increase the neutrino flux by about 10%, while reducing the intrinsic background due to wrong sign neutrino contamination. Upgrades to the MC tuning using 2010 NA61/SHINE replica target data are also expected to reduce systematic uncertainties in the production process of π and K mesons. In this study we evaluate the systematic uncertainties of the neutrino flux with these upgrades.

  37. A novel water-Cherenkov detector design with retro-reflectors to produce antipodal rings

    Lukas Berns

    XXVIII International Conference on Neutrino Physics and Astrophysics (Neutrino 2018) 2018/06/04

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    Since Kamiokande, the basic design of water-Cherenkov detectors has not changed: the walls of a water tank are lined with photodetectors that capture Cherenkov photons produced by relativistic particles. However, with this design the majority of photons are lost in insensitive regions between photodetectors, while at the same time most photodetectors are outside the ring and remain dark. To fix both issues at once, we propose fixing retro-reflectors between all photodetectors. These devices will reflect uncollected photons back through their emission point onto photodetectors at the other side of the tank, producing a secondary, delayed Cherenkov ring. Numerical simulations show that, due to the parallax effect of this antipodal ring, our system can yield up to 2x improvement of detector vertex and angle resolutions. This improvement would be beneficial for kinematic selection of multi-ring events and would lower detector costs by decreasing the number of required photodetectors.

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Research Projects 2

  1. Measurement and global analysis of hadron scattering for the precise measurement of neutrino oscillations

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Early-Career Scientists

    Institution: Tohoku University

    2023/04/01 - 2028/03/31

  2. チェレンコフ光の精密再構成によるニュートリノ振動解析とCP対称性の破れの探索

    BERNS LUKAS

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東京工業大学

    2019/04/25 - 2022/03/31

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    再帰反射材に関してはまずMCを用いた再構成を開発。特定の条件下で以前の簡単な感度計算の結果が確認できた。ただし位置と方向の両方が良くなると思っていたところ、方向に関しては改善が見られないことがわかったが、これは以前のモデルが簡単すぎて、物理的に再構成不可能であると今考えている。 再帰反射材の測定環境を構築し、反射率およびアクセプタンスを実機で測定。上のシミュレーションにおいてこれらの仮定まだ理想的すぎることが確認できた。今年度のはじめにデータを元にシミュレーションに変更を加えもう一度確認する。その一方で非常に安くかつ比較的現実的にできるかもしれない別のデザイン(擬似再帰反射と普通の鏡の併用)も着想、これも検証予定。 チェレンコフ光のゆらぎに関しても実装は出来たものの想定以上に複雑なモデルが必要であることがわかり、かつ感度の改善も限定的。そこで別なアプローチとして機械学習を用いた再構成の開発を4月に開催されたワークショップを機に開始。これは結構順調で、まだ最尤法のフィッターほどの感度は出ていないところも多いが、非常に高速で、既存の遅い手法と組み合わせた利用などが考えられる。幾何学を入れるモデルとして新しい手法を提案し、学会発表したが、これは水チェレンコフ以外の様々な用途にも応用できると思われる。 これらの内容についての学会発表においては「面白い研究なので是非続けていただきたい」とのコメントを頂いたり、富山にて実施された国際学会においてもポスターの佳作賞を頂くことができた。 他ビームシミュレーションも開発が進み、ニュートリノ振動解析も2019/20年のT2K実験データをメイン・アナライザーの一人として進めているほか、スーパーカミオカンデの大気ニュートリノとの合同解析に向けた準備として、数値計算で使う振動確率モデルの改善(数値解に一部解析解を取り入れて標本誤差を削減)も行うことができた。

Social Activities 4

  1. データサイエンス素粒子原子核

    オンライン

    2022/10/23 -

  2. 「ニュートリノで拓く素粒子と宇宙」パンフレット

    26,27頁

    2021/03 -

  3. データサイエンス素粒子原子核

    オンライン

    2020/12/19 -

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    データサイエンスは科学分野のみならず、近年経済マーケティングの分野でもめざましい発展を遂げています。 現在国内外で行われている大型加速器を用いた素粒子原子核実験では膨大なデータの中から希に生じる新粒子、新しい物理現象を示唆する事象をデータサイエンスのテクニックを駆使して探索しています。 本プログラムでは様々な素粒子原子核実験プロジェクトより公開されているオープンデータや擬似データを利用して実際に物理データ解析を行います。一連の物理解析を通じてデータサイエンスの基礎を習得することを目標とします。 またこのような素粒子原子核実験で活躍されている先生や若手の研究者の方から実験プロジェクトの紹介およびデータサイエンスの応用例を説明していただく講義も行います。 東工大基金 理科教育振興の支援を受けた活動です。 自分(ルカス)は第六日のニュートリノ回において研究紹介および統計解析の教材作成及び実習を担当させていただきました。

  4. 一般向け講演会「みんなに分かるニュートリノのお話」ー素粒子と宇宙についてー

    日本科学未来館・未来館ホール

    2018/08/19 -

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    不思議な素粒子ニュートリノ!ニュートリノを研究することで、素粒子や宇宙の謎がい ろいろなわかってきています。子供から大人まで、皆さんにわかるようにニュートリノ のお話をする予定です。ぜひ、みなさんとニュートリノ研究の面白さ、素粒子や宇宙の 不思議を一緒に考えてみたいと思います。気軽にご参加ください。 〇プログラム 「はじめに」 中家 剛(京都大学教授) 「素粒子(実験)の世界」 秋本 祐希(HiggsTan) 「スーパーカミオカンデ実験でわかったこと」 ウェンデル ロジャー(京都大学准教授) 「宇宙ニュートリノの発見」 石原 安野(千葉大学准教授) 「ニュートリノと鍛え合った写真技術は世界を透視し、知は続き、 つながってゆく」 長縄 直崇(名古屋大学研究員) 「質問コーナー」 ベルンス ルカス(東京工業大学大学院生)