Details of the Researcher

PHOTO

Shoichi Sasaki
Section
Graduate School of Science
Job title
Associate Professor
Degree

  • 博士(理学) (Osaka University)

Research History 7

  • 2012/04 - Present
    Department of Physics, Tohoku University　Associate Professor

  • 2007/04 - 2012/03
    Physics of Department, University of Tokyo　Assistant Professor

  • 2006/10 - 2007/03
    Physics of Department, University of Tokyo　Research Associate

  • 2004/10 - 2006/09
    RIKEN BNL Research Center　RBRC Fellow

  • 2000/10 - 2004/09
    Department of Physics, University of Tokyo　Research Associate

  • 1998/09 - 2000/09
    RIKEN BNL Research Center　Postdoctal Research Associate

  • 1997/04 - 1998/08
    Yukawa Institute of Theoretical Physics, Kyoto University　JSPS Research Fellowship

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Education 3

  • Osaka University　Graduate School, Division of Natural Science　Department of Physics

    1994/04 - 1997/03

  • Tokyo Metropolitan University　Graduate School, Division of Natural Science　Department of Physics

    1992/04 - 1994/03

  • Tokyo University of Scienc　Faculty of Science　Department of Physics

    1988/04 - 1992/03

Committee Memberships 6

  • 日本物理学会第81-82期代議員　国内外学会役員等

    2025/04 - Present

  • 日本物理学会第79-80期代議員　国内外学会役員等

    2023/04 - 2025/03

  • 東北大学電子光理学研究センター運営委員　学内委員

    2019/08 - 2023/03

  • 大阪大学核物理研究センター研究計画検討専門委員会(Q-PAC)委員　他大学共同利用機関委員等

    2016/09 - 2023/03

  • 日本物理学会理論核物理領域プログラム委員　国内外学会役員等

    2017/04 - 2019/03

  • 日本物理学会理論核物理領域運営委員　国内外学会役員等

    2012/04 - 2013/03

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Professional Memberships 1

  • 日本物理学会

Research Interests 2

  • Lattice gauge theory

  • Hadron physics

Research Areas 1

  • Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics /

Awards 2

  1. 10th HPCI Excellent Achievement Award

    2023/10　Research Organization for Information Science and Technology (RIST)　Precision computations of particle and nuclear physics with lattice QCD

  2. 4TH JPS Best Paper Award from The Physical Society of Japan (JPS)

    1999/04　The Physical Society of Japan (JPS)　受賞論文：Prog. Theor. Phys. 94 (1995) 373-384

Papers 112

  1. Lattice study of scattering phase shifts for DD* and BB* systems using twisted boundary conditions: Search for bound state formation Peer-reviewed

    Masato Nagatsuka, Shoichi Sasaki

    Physical Review D　112　114510　2025/12/17

    DOI： 10.1103/ksmm-8d7r 　

  2. Triad representation for the anisotropic tensor renormalization group in four dimensions Peer-reviewed

    Yuto Sugimoto, Shoichi Sasaki

    Physical Review D　112　094514　2025/11/25

    DOI： 10.1103/c3qc-tn48 　

  3. Method for high-precision determination of the nucleon axial structure using lattice QCD: Removing πN -state contamination Peer-reviewed

    Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Kohei Sato, Eigo Shintani, Ryutaro Tsuji, Hiromasa Watanabe, Takeshi Yamazaki

    Physical Review D　112　074510　2025/10/17

    DOI： 10.1103/2y8x-5lyc 　

  4. Glueball mass spectrum at finite temperature revisited: Constant contribution in glueball correlators in the deconfinement phase Peer-reviewed

    Toshizo Arikawa, Keita Sakai, Shoichi Sasaki

    Physical Review D　112　014506　2025/07/07

    DOI： 10.1103/3qy4-b8ym 　

  5. A proposal for removing $\pi N$-state contamination from the nucleon induced pseudoscalar form factor in lattice QCD Peer-reviewed

    Shoichi Sasaki, Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Kohei Sato, Eigo Shintani, Ryutaro Tsuji, Hiromasa Watanabe, Takeshi Yamazaki

    Proceedings of The 41st International Symposium on Lattice Field Theory — PoS(LATTICE2024)　310-310　2025/01/27

    Publisher: Sissa Medialab

    DOI： 10.22323/1.466.0310 　

  6. Studies of nucleon isovector structures with the PACS10 superfine lattice Peer-reviewed

    Ryutaro Tsuji, Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Kohei Sato, Eigo Shintani, Hiromasa Watanabe, Takeshi Yamazaki

    Proceedings of The 41st International Symposium on Lattice Field Theory — PoS(LATTICE2024)　318-318　2025/01/16

    Publisher: Sissa Medialab

    DOI： 10.22323/1.466.0318 　

  7. Applying the Triad network representation to four-dimensional ATRG method Peer-reviewed

    Yuto Sugimoto, Shoichi Sasaki

    Proceedings of The 41st International Symposium on Lattice Field Theory — PoS(LATTICE2024)　038-038　2025/01/06

    Publisher: Sissa Medialab

    DOI： 10.22323/1.466.0038 　

  8. Extraction of the $S$-wave and $P$-wave $D D^\ast$ scattering phase shifts using twisted boundary conditions Peer-reviewed

    Masato Nagatsuka, Shoichi Sasaki

    Proceedings of The 41st International Symposium on Lattice Field Theory — PoS(LATTICE2024)　090-090　2024/12/05

    Publisher: Sissa Medialab

    DOI： 10.22323/1.466.0090 　

  9. Nucleon form factors in Nf=2+1 lattice QCD at the physical point: Finite lattice spacing effect on the root-mean-square radii Peer-reviewed

    Tsuji, R., Aoki, Y., Ishikawa, K.-I., Kuramashi, Y., Sasaki, S., Sato, K., Shintani, E., Watanabe, H., Yamazaki, T.

    Physical Review D　109　(9)　094505　2024/05/10

    DOI： 10.1103/PhysRevD.109.094505 　

    ISSN： 2470-0010 2470-0029

  10. Prospects for the stout smearing as an equivalent approach to the Wilson flow Peer-reviewed

    Masato Nagatsuka, Keita Sakai, Shoichi Sasaki

    Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)　360-360　2023/12/27

    Publisher: Sissa Medialab

    DOI： 10.22323/1.453.0360 　

  11. Discretization effects on nucleon root-mean-square radii from lattice QCD at the physical point Peer-reviewed

    Ryutaro Tsuji, Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Shoich Sasaki, Eigo Shintani, Takeshi Yamazaki

    Proceedings of The 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)　323-323　2023/12/27

    Publisher: Sissa Medialab

    DOI： 10.22323/1.453.0323 　

  12. Equivalence between the Wilson flow and stout-link smearing Peer-reviewed

    Nagatsuka, M., Sakai, K., Sasaki, S.

    Physical Review D　108　(9)　094506　2023/11/14

    DOI： 10.1103/PhysRevD.108.094506 　

    ISSN： 2470-0010 2470-0029

  13. Towards the continuum limit of nucleon form factors at the physical point using lattice QCD Peer-reviewed

    Ryutaro Tsuji, Yasumichi Aoki, Ken Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Eigo Shintani, Takeshi Yamazaki

    Proceedings of Science　430　2023/04/06

    eISSN： 1824-8039

  14. Glueball spectroscopy in lattice QCD using gradient flow Peer-reviewed

    Sakai, K., Sasaki, S.

    Physical Review D　107　(3)　034510　2023/02/27

    DOI： 10.1103/PhysRevD.107.034510 　

    ISSN： 2470-0010 2470-0029

  15. Nucleon Isovector Tensor Charge from Lattice QCD with Physical Light Quarks

    Ryutaro Tsuji, Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Eigo Shintani, Takeshi Yamazaki

    Proceedings of the 24th International Spin Symposium (SPIN2021)　2022/12/26

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.37.020202 　

  16. Nucleon isovector couplings in Nf=2+1 lattice QCD at the physical point Peer-reviewed

    Tsuji, Ryutaro, Tsukamoto, Natsuki, Aoki, Yasumichi, Ishikawa, Ken-Ichi, Kuramashi, Yoshinobu, Sasaki, Shoichi, Shintani, Eigo, Yamazaki, Takeshi

    Physical Review D　106　(9)　094505-094505　2022/11/01

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevD.106.094505 　

    ISSN： 2470-0010 2470-0029

  17. An improvement of glueball mass calculations using gradient flow Peer-reviewed

    Keita Sakai, Shoichi Sasaki

    Proceedings of Science　396　2022/07/08

    eISSN： 1824-8039

  18. The lower moments of nucleon structure functions in lattice QCD with physical quark masses Peer-reviewed

    Ryutaro Tsuji, Yasumichi Aoki, Ken Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Eigo Shintani, Takeshi Yamazaki

    Proceedings of Science　396　2022/07/08

    eISSN： 1824-8039

  19. Nucleon scalar and tensor couplings from lattice QCD at the physical points

    Ryutaro Tsuji, Yasumichi Aoki, Ken Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Eigo Shintani, Takeshi Yamazaki

    15th Conference on Quark Confinement and the Hadron Spectrum, Confinement 2022　2022

    DOI： 10.1051/epjconf/202227406009 　

  20. Calculation of the derivative of nucleon form factors in lattice QCD at on a volume Peer-reviewed

    Ishikawa, K.-I., Kuramashi, Y., Sasaki, S., Shintani, E., Yamazaki, T.

    Physical Review D　104　(7)　074514-1-074514-20　2021/10/15

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevD.104.074514 　

    ISSN： 2470-0010 2470-0029

  21. Nucleon isovector couplings from 2+1 flavor lattice QCD at the physical point Peer-reviewed

    N. Tsukamoto, Y. Aoki, K.-I. Ishikawa, Y. Kuramashi, E. Shintani, S. Sasaki, T. Yamazaki

    Proceedings of Science LATTICE 2019　132-1-132-6　2020/05

  22. Erratum: Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point (Physical Review D (2019) 99 (014510) DOI: 10.1103/PhysRevD.99.014510)

    Shintani, E., Ishikawa, K.-I., Kuramashi, Y., Sasaki, S., Yamazaki, T.

    Physical Review D　102　(1)　2020

    DOI： 10.1103/PhysRevD.102.019902 　

    ISSN： 2470-0010 2470-0029

  23. Image-processing the topological charge density in the $\mathbb{C}P^{N-1}$ model Peer-reviewed

    Yuya Abe, Kenji Fukushima, Yoshimasa Hidaka, Hiroaki Matsueda, Koichi Murase, Shoichi Sasaki

    Progress of Theoretical and Experimental Physics　2020　(1)　013D02-01-013D02-19　2020/01/01

    Publisher: Oxford University Press (OUP)

    DOI： 10.1093/ptep/ptz134 　

    eISSN： 2050-3911

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    <title>Abstract</title> We study the topological charge density distribution using the 2D $\mathbb{C}P^{N-1}$ model. We numerically compute not only the topological susceptibility, which is a spatially global quantity, to probe the topological properties of the whole system, but also the topological charge correlator with finite momentum. We perform a Fourier power spectrum analysis for the topological charge density for various values of the inverse temperature $\beta$. We propose to utilize the Fourier entropy as a convenient measure to characterize spatial distribution patterns and demonstrate that the Fourier entropy exhibits nontrivial temperature dependence. We also consider the snapshot entropy defined with the singular value decomposition, which also turns out to behave nonmonotonically with the temperature. We give a possible interpretation suggested from the strong-coupling analysis.

  24. Nucleon Iso-vector Couplings from Lattice QCD Using 2 + 1 Flavor Domain Wall Fermions Peer-reviewed

    Natsuki Tsukamoto, Shoichi Sasaki

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)　26　031011-1-031011-4　2019/11/08

    Publisher: Journal of the Physical Society of Japan

    DOI： 10.7566/jpscp.26.031011 　

  25. Nucleon form factors and root-mean-square radii on a (10.8 fm$)^4$ lattice at the physical point Peer-reviewed

    Eigo Shintani, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Shoichi Sasaki, Takeshi Yamazaki

    Phys. Rev. D 99, 014510 (2019)　99　(1)　014510-1-014510-23　2019/01

    Publisher: American Physical Society ({APS})

    DOI： 10.1103/PhysRevD.99.014510 　

    ISSN： 2470-0010 2470-0029

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    We present the nucleon form factors and root-mean-square (RMS) radii measured on a (10.8 fm$)^4$ lattice at the physical point. We compute the form factors at small momentum transfer region in $q^2\le 0.102$ GeV$^2$ with the standard plateau method choosing four source-sink separation times $t_{\rm sep}$ from 0.84 to 1.35 fm to examine the possible excited state contamination. We obtain the electric and magnetic form factors and their RMS radii for not only the isovector channel but also the proton and neutron ones without the disconnected diagram. We also obtain the axial-vector coupling and the axial radius from the axial-vector form factor. We find that these three form factors do not show large $t_{\rm sep}$ dependence in our lattice setup, and those RMS radii are consistent with the experimental values. On the other hand, the induced pseudoscalar and pseudoscalar form factors show the clear effects of the excited state contamination, which affect the generalized Goldberger-Treiman relation.

  26. Nucleon form factors on a large volume lattice near the physical point in 2+1 flavor QCD Peer-reviewed

    Ishikawa, K.-I., Kuramashi, Y., Sasaki, S., Tsukamoto, N., Ukawa, A., Yamazaki, T.

    Physical Review D　98　(7)　074510-1-074510-23　2018/10

    DOI： 10.1103/PhysRevD.98.074510 　

    ISSN： 2470-0010 2470-0029

  27. Nucleon structure from 2+1 flavor lattic e QCD near the physical point Peer-reviewed

    Tsukamoto, Natsuki, Ishikawa, Ken-Ichi, Kuramashi, Yoshinobu, Sasaki, Shoichi, Yamazaki, Takeshi

    EPJ Web Conf.　175　(06007)　2018/03

  28. Continuum limit of hyperon vector coupling f(1)(0) from 2+1 flavor domain wall QCD Peer-reviewed

    Shoichi Sasaki

    PHYSICAL REVIEW D　96　(7)　074509-1-074509-17　2017/10

    DOI： 10.1103/PhysRevD.96.074509 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  29. Numerical study of tree-level improved lattice gradient flows in pure Yang-Mills theory Peer-reviewed

    Norihiko Kamata, Shoichi Sasaki

    PHYSICAL REVIEW D　95　(5)　054501-1-054501-17　2017/03

    DOI： 10.1103/PhysRevD.95.054501 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  30. Bethe-Salpeter wave functions of eta(c)(2S) and psi(2S) states from full lattice QCD Peer-reviewed

    Kazuki Nochi, Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW D　94　(11)　114514-1-114514-12　2016/12

    DOI： 10.1103/PhysRevD.94.114514 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  31. SU(3)-breaking effects and induced second-class form factors in hyperon beta decays from 2+1 flavor lattice QCD

    Shoichi Sasaki

    Proceedings of Science　LATTICE 2015　120-1-120-7　2016/07/09

  32. Lattice gradient flow with tree-level $O(a^4)$ improvement in pure Yang-Mills theory

    Norihiko Kamata, Shoichi Sasaki

    Proceedings of Science　LATTICE 2015　301-1-301-7　2016/07/09

  33. Nucleon form factors near the physical point in 2+1 flavor QCD

    K. I. Ishikawa, Y. Kuramashi, N. Tsukamoto, S. Sasaki, T. Yamazaki, A. Ukawa

    Proceedings of Science　128557　2016

    Publisher: Proceedings of Science (PoS)

    ISSN： 1824-8039

  34. Potential description of the charmonium from lattice QCD

    Taichi Kawanai, Shoichi Sasaki

    XITH CONFERENCE ON QUARK CONFINEMENT AND HADRON SPECTRUM　1701　050022-1-050022-12　2016

    DOI： 10.1063/1.4938662 　

    ISSN： 0094-243X

  35. Potential description of charmonium and charmed-strange mesons from lattice QCD Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW D　92　(9)　094503-1-094503-23　2015/11

    DOI： 10.1103/PhysRevD.92.094503 　

    ISSN： 1550-7998

    eISSN： 1550-2368

  36. Status of Semileptonic Hyperon Decays from Lattice QCD using 2+1 flavor Domain Wall Fermions

    Shoichi Sasaki

    Proceedings of Science　LATTICE 2013　388-1-388-7　2014/05/01

  37. Heavy quarkonium potential from Bethe-Salpeter wave function on the lattice Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW D　89　(5)　054507-1-054507-20　2014/03

    DOI： 10.1103/PhysRevD.89.054507 　

    ISSN： 1550-7998

    eISSN： 1550-2368

  38. Accelerating ab initio nucleon structure calculations with all-mode-Averaging on gordon Peer-reviewed

    Meifeng Lin, Yasumichi Aoki, Thomas Blum, Taku Izubuchi, Chulwoo Jung, Shigemi Ohta, Eigo Shintani, Takeshi Yamazaki, Shoichi Sasaki

    ACM International Conference Proceeding Series　2014

    Publisher: Association for Computing Machinery

    DOI： 10.1145/2616498.2616516 　

  39. Luscher's finite size method with twisted boundary conditions: An application to the J/psi-phi system to search for a narrow resonance Peer-reviewed

    Sho Ozaki, Shoichi Sasaki

    PHYSICAL REVIEW D　87　(1)　014506-1-014506-14　2013/01

    DOI： 10.1103/PhysRevD.87.014506 　

    ISSN： 1550-7998

  40. Hyperon vector form factor from 2+1 flavor lattice QCD Peer-reviewed

    Shoichi Sasaki

    PHYSICAL REVIEW D　86　(11)　114502-1-114502-7　2012/12

    DOI： 10.1103/PhysRevD.86.114502 　

    ISSN： 1550-7998

  41. Charmonium potential from full lattice QCD Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW D　85　(9)　091503(R)　2012/05

    DOI： 10.1103/PhysRevD.85.091503 　

    ISSN： 1550-7998

  42. Interquark potential for the charmonium system with almost physical quark masses Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    Progress in Particle and Nuclear Physics　67　(2)　130-135　2012/04

    DOI： 10.1016/j.ppnp.2011.12.006 　

    ISSN： 0146-6410

  43. Complex Heavy-Quark Potential at Finite Temperature from Lattice QCD Peer-reviewed

    Alexander Rothkopf, Tetsuo Hatsuda, Shoichi Sasaki

    PHYSICAL REVIEW LETTERS　108　(16)　162001.1-162001.5　2012/04

    DOI： 10.1103/PhysRevLett.108.162001 　

    ISSN： 0031-9007

  44. Lattice study of J/Ψ- Pdbl scattering at low energies to search for narrow resonance

    Sho Ozaki, Shoichi Sasaki

    Proceedings of Science　Part F130497　2012

    eISSN： 1824-8039

  45. Interquark Potential with Finite Quark Mass from Lattice QCD Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW LETTERS　107　(9)　2011/08

    DOI： 10.1103/PhysRevLett.107.091601 　

    ISSN： 0031-9007

  46. Interquark potential for the charmonium system with almost physical quark masses

    Taichi Kawanai, Shoichi Sasaki

    Proceedings of Science　139　2011

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  47. Hyperon vector coupling f1(0) from 2+1 flavor lattice QCD Peer-reviewed

    Shoichi Sasaki

    AIP Conference Proceedings　1388　443-446　2011

    DOI： 10.1063/1.3647427 　

    ISSN： 0094-243X 1551-7616

  48. Charmonium-nucleon interaction from lattice QCD with 2+1 flavors of dynamical quarks Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    AIP Conference Proceedings　1388　640-643　2011

    DOI： 10.1063/1.3647474 　

    ISSN： 0094-243X 1551-7616

  49. Charmonium-nucleon potential from lattice QCD Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    PHYSICAL REVIEW D　82　(9)　2010/11

    DOI： 10.1103/PhysRevD.82.091501 　

    ISSN： 1550-7998

  50. Nucleon isovector structure functions in (2+1)-flavor QCD with domain wall fermions Peer-reviewed

    Yasumichi Aoki, Tom Blum, Huey-Wen Lin, Shigemi Ohta, Shoichi Sasaki, Robert Tweedie, James Zanotti, Takeshi Yamazaki

    PHYSICAL REVIEW D　82　(1)　2010/07

    DOI： 10.1103/PhysRevD.82.014501 　

    ISSN： 1550-7998

  51. Study of charmonium-nucleon interaction in lattice QCD Peer-reviewed

    Taichi Kawanai, Shoichi Sasaki

    AIP Conference Proceedings　1296　294-297　2010

    DOI： 10.1063/1.3523189 　

    ISSN： 0094-243X 1551-7616

  52. Nucleon form factors with 2+1 flavor dynamical domain-wall fermions Peer-reviewed

    Takeshi Yamazaki, Yasumichi Aoki, Tom Blum, Huey-Wen Lin, Shigemi Ohta, Shoichi Sasaki, Robert Tweedie, James Zanotti

    Physical Review D - Particles, Fields, Gravitation and Cosmology　79　(11)　2009/06/29

    DOI： 10.1103/PhysRevD.79.114505 　

    ISSN： 1550-7998 1550-2368

    eISSN： 2470-0029

  53. Lattice study of flavor SU(3) breaking in hyperon beta decay Peer-reviewed

    Shoichi Sasaki, Takeshi Yamazaki

    PHYSICAL REVIEW D　79　(7)　2009/04

    DOI： 10.1103/PhysRevD.79.074508 　

    ISSN： 1550-7998

  54. Proper heavy-quark potential from a spectral decomposition of the thermal Wilson loop

    A. Rothkopf, T. Hatsuda, S. Sasaki

    Proceedings of Science　91　2009

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  55. Physical results from 2+1 flavor domain wall QCD and SU(2) chiral perturbation theory Peer-reviewed

    C. Allton, D. J. Antonio, Y. Aoki, T. Blum, P. A. Boyle, N. H. Christ, M. A. Clark, S. D. Cohen, C. Dawson, M. A. Donnellan, J. M. Flynn, A. Hart, T. Izubuchi, C. Jung, A. Jüttner, A. D. Kennedy, R. D. Kenway, M. Li, S. Li, M. F. Lin, R. D. Mawhinney, C. M. Maynard, S. Ohta, B. J. Pendleton, C. T. Sachrajda, S. Sasaki, E. E. Scholz, A. Soni, R. J. Tweedie, J. Wennekers, T. Yamazaki, J. M. Zanotti

    Physical Review D - Particles, Fields, Gravitation and Cosmology　78　(11)　2008/12/01

    DOI： 10.1103/PhysRevD.78.114509 　

    ISSN： 1550-7998 1550-2368

    eISSN： 2470-0029

  56. Nucleon structure with two flavors of dynamical domain-wall fermions Peer-reviewed

    Huey-Wen Lin, Tom Blum, Shigemi Ohta, Shoichi Sasaki, Takeshi Yamazaki

    PHYSICAL REVIEW D　78　(1)　2008/07

    DOI： 10.1103/PhysRevD.78.014505 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  57. Nucleon form factors from quenched lattice QCD with domain wall fermions Peer-reviewed

    Shoichi Sasaki, Takeshi Yamazaki

    PHYSICAL REVIEW D　78　(1)　014510　2008/07

    DOI： 10.1103/PhysRevD.78.014510 　

    ISSN： 1550-7998

  58. Kl3 form factor with Nf 2 +1 dynamical domain wall fermions Peer-reviewed

    P. A. Boyle, J. M. Flynn, A. Jüttner, R. D. Kenway, C. T. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, J. M. Zanotti

    Journal of Physics: Conference Series　110　(10)　2008/06/30

    Publisher: Institute of Physics Publishing

    DOI： 10.1088/1742-6596/110/10/102012 　

    ISSN： 1742-6596 1742-6588

  59. Nucleon structure with two flavors of dynamical domain-wall fermions Peer-reviewed

    Huey-Wen Lin, Tom Blum, Shigemi Ohta, Shoichi Sasaki, Takeshi Yamazaki

    Phys.Rev.D78:014505,2008　78　(1)　014505　2008/06

    DOI： 10.1103/PhysRevD.78.014505 　

    ISSN： 1550-7998

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    We present a numerical lattice quantum chromodynamics calculation of isovector form factors and the first few moments of the isovector structure functions of the nucleon. The calculation employs two degenerate dynamical flavors of domain-wall fermions, resulting in good control of chiral symmetry breaking. Non-perturbative renormalization of the relevant quark currents is performed where necessary. The inverse lattice spacing, $a^{-1}$, is about 1.7 GeV. We use degenerate up and down dynamical quark masses around 1, 3/4 and 1/2 the strange quark mass. The physical volume of the lattice is a...

  60. Nucleon axial charge in (2+1)-flavor dynamical-lattice QCD with domain-wall fermions Peer-reviewed

    T. Yamazaki, Y. Aoki, T. Blum, H. W. Lin, M. F. Lin, S. Ohta, S. Sasaki, R. J. Tweedie, J. M. Zanotti

    PHYSICAL REVIEW LETTERS　100　(17)　171602　2008/05

    DOI： 10.1103/PhysRevLett.100.171602 　

    ISSN： 0031-9007

  61. Kl3 semileptonic form factor from (2+1)-flavor lattice QCD Peer-reviewed

    P. A. Boyle, A. Juettner, R. D. Kenway, C. T. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, J. M. Zanotti

    PHYSICAL REVIEW LETTERS　100　(14)　141601　2008/04

    DOI： 10.1103/PhysRevLett.100.141601 　

    ISSN： 0031-9007

  62. 2+1 flavor domain wall QCD on a (2 fm)(3) lattice: Light meson spectroscopy with Ls=16 Peer-reviewed

    C. Allton, D. J. Antonio, T. Blum, K. C. Bowler, P. A. Boyle, N. H. Christ, S. D. Cohen, M. A. Clark, C. Dawson, A. Hart, K. Hashimoto, T. Izubuchi, A. Juettner, C. Jung, A. D. Kennedy, R. D. Kenway, M. Li, S. Li, M. F. Lin, R. D. Mawhinney, C. M. Maynard, J. Noaki, S. Ohta, B. J. Pendleton, S. Sasaki, E. E. Scholz, A. Soni, R. J. Tweedie, A. Yamaguchi, T. Yamazaki

    PHYSICAL REVIEW D　76　(1)　2007/07

    DOI： 10.1103/PhysRevD.76.014504 　

    ISSN： 1550-7998

  63. First results from 2+1-flavor domain wall QCD: Mass spectrum, topology change, and chiral symmetry with L-s=8 Peer-reviewed

    D. J. Antonio, T. Blum, K. C. Bowler, P. A. Boyle, N. H. Christ, S. D. Cohen, M. A. Clark, C. Dawson, A. Hart, K. Hashimoto, T. Izubuchi, B. Joo, C. Jung, A. D. Kennedy, R. D. Kenway, S. Li, H. W. Lin, M. F. Lin, R. D. Mawhinney, C. M. Maynard, J. Noaki, S. Ohta, S. Sasaki, A. Soni, R. J. Tweedie, A. Yamaguchi

    PHYSICAL REVIEW D　75　(11)　2007/06

    DOI： 10.1103/PhysRevD.75.114501 　

    ISSN： 1550-7998

    eISSN： 1550-2368

  64. Identification of shallow two-body bound states in finite volume

    Shoichi Sasaki, Takeshi Yamazaki

    Proceedings of Science　42　2007

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  65. K to πsemileptonic form factor with 2+1 flavor domain wall Fermions on the lattice

    D. J. Antonio, P. A. Boyle, C. Dawson, T. Izubuchi, A. Jüttner, C. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, J. M. Zanotti

    Proceedings of Science　2007

    ISSN： 1824-8039

  66. Vector form factor in K-l3 semileptonic decay with two flavors of dynamical domain-wall quarks Peer-reviewed

    Chris Dawson, Taku Izubuchi, Takashi Kaneko, Shoichi Sasaki, Amarjit Soni

    PHYSICAL REVIEW D　74　(11)　2006/12

    DOI： 10.1103/PhysRevD.74.114502 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  67. First lattice study of low-energy charmonium-hadron interaction Peer-reviewed

    Kazuo Yokokawa, Shoichi Sasaki, Tetsuo Hatsuda, Arata Hayashigaki

    PHYSICAL REVIEW D　74　(3)　2006/08

    DOI： 10.1103/PhysRevD.74.034504 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  68. K →πlν form factor with Nf = 2+1 dynamical domain wall fermions

    D. J. Antonio, P. A. Boyle, C. Dawson, T. Izubuchi, A. Jüttner, C. Sachrajda, S. Sasaki, A. Soni, R. J. Tweedie, J. M. Zanotti

    Proceedings of Science　32　2006

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  69. SU(3) breaking effects in hyperon beta decay from lattice QCD

    Shoichi Sasaki, Takeshi Yamazaki

    Proceedings of Science　32　2006

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  70. Signatures of S-wave bound-state formation in finite volume Peer-reviewed

    Shoichi Sasaki, Takeshi Yamazaki

    Physical Review D - Particles, Fields, Gravitation and Cosmology　74　(11)　114507　2006

    DOI： 10.1103/PhysRevD.74.114507 　

    ISSN： 1550-7998 1550-2368

    eISSN： 2470-0029

  71. Vector form factor in Kl3 semileptonic decay with two flavors of dynamical domain-wall quarks Peer-reviewed

    Chris Dawson, Taku Izubuchi, Takashi Kaneko, Shoichi Sasaki, Amarjit Soni

    Physical Review D - Particles, Fields, Gravitation and Cosmology　74　(11)　114502　2006

    DOI： 10.1103/PhysRevD.74.114502 　

    ISSN： 1550-7998 1550-2368

  72. K_l3 form factor with two flavors of dynamical domain-wall quarks

    Takashi Kaneko, Chris Dawson, T. Izubuchi, Shoichi Sasaki, Amarjit Soni

    Proceedings of XXIIIrd International Symposium on Lattice Field Theory — PoS(LAT2005)　2005/12/14

    Publisher: Sissa Medialab

    DOI： 10.22323/1.020.0337 　

  73. Spectral analysis of excited nucleons in lattice QCD with maximum entropy method Peer-reviewed

    K Sasaki, S Sasaki, T Hatsuda

    PHYSICS LETTERS B　623　(3-4)　208-217　2005/09

    DOI： 10.1016/j.physletb.2005.07.026 　

    ISSN： 0370-2693

    eISSN： 1873-2445

  74. Strange tribaryons as nona-quark states Peer-reviewed

    Y Maezawa, T Hatsuda, S Sasaki

    PROGRESS OF THEORETICAL PHYSICS　114　(2)　317-327　2005/08

    DOI： 10.1143/PTP.114.317 　

    ISSN： 0033-068X

  75. Excited baryon spectroscopy from lattice QCD: Finite size effect and hyperfine mass splitting Peer-reviewed

    K Sasaki, S Sasaki

    PHYSICAL REVIEW D　72　(3)　2005/08

    DOI： 10.1103/PhysRevD.72.034502 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  76. Pentaquarks: Status and perspectives for lattice calculations

    Sasaki, S.

    Nuclear Physics B Proceedings Supplements　140　(SPEC. ISS.)　2005

    DOI： 10.1016/j.nuclphysbps.2004.11.354 　

    ISSN： 0920-5632

  77. Highlights of pentaquark spectroscopy from lattice calculations

    Sasaki, S.

    Nuclear Physics A　752　(1-4 SPEC. ISS.)　2005

    DOI： 10.1016/j.nuclphysa.2005.02.090 　

    ISSN： 0375-9474

  78. Low-energy J/ψ-hadron interactions from quenched lattice QCD

    Kazuo Yokokawa, Shoichi Sasaki, Arata Hayashigaki, Tetsuo Hatsuda

    Proceedings of Science　20　2005

    Publisher: Sissa Medialab Srl

    ISSN： 1824-8039

  79. Lattice study of the exotic S=+1 baryon Peer-reviewed

    S Sasaki

    PHYSICAL REVIEW LETTERS　93　(15)　152001　2004/10

    DOI： 10.1103/PhysRevLett.93.152001 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  80. Excited nucleon spectrum from lattice QCD with maximum entropy method

    K. Sasaki, S. Sasaki, T. Hatsuda, M. Asakawa

    Nuclear Physics B - Proceedings Supplements　129-130　212-214　2004

    Publisher: Elsevier

    DOI： 10.1016/S0920-5632(03)02533-7 　

    ISSN： 0920-5632

  81. Nucleon axial charge from quenched lattice QCD with domain wall fermions Peer-reviewed

    S Sasaki, K Orginos, S Ohta, T Blum

    PHYSICAL REVIEW D　68　(5)　054509　2003/09

    DOI： 10.1103/PhysRevD.68.054509 　

    ISSN： 0556-2821

  82. Nucleon matrix elements with domain wall ferions

    Orginos, K., Aoki, Y., Blum, T., Christ, N., Dawson, C., Izubuchi, T., Levkova, L., Liao, X., Liu, G., Mawhinney, R., Nemoto, Y., Noaki, J., Ohta, S., Prelovsek, S., Sasaki, S., Soni, A.

    Nuclear Physics B Proceedings Supplements　119　2003

    DOI： 10.1016/S0920-5632(03)01562-7 　

    ISSN： 0920-5632

  83. Calculation weak matrix elements in domain-wall QCD with the DBW2 gauge action

    Noaki, J., Aoki, Y., Blum, Y., Christ, N., Creutz, M., Dawson, C., Izubuchi, T., Levkova, L., Liao, X., Liu, G., Mawhinney, R., Nemoto, Y., Ohta, S., Orginos, K., Prelovsek, S., Sasaki, S., Soni, A.

    Nuclear Physics B Proceedings Supplements　119　2003

    DOI： 10.1016/S0920-5632(03)01552-4 　

    ISSN： 0920-5632

  84. Nucleon axial charge from quenched lattice QCD with domain wall fermions and DBW2 gauge action Peer-reviewed

    Shigemi Ohta, Y. Aoki, T. Blum, N. Christ, M. Creutz, C. Dawson, T. Izubuchi, L. Levkova, X. Liao, G. Liu, R. Mawhinney, Y. Nemoto, J. Noaki, K. Orginos, S. Prelovack, S. Sasaki, A. Soni

    Nuclear Physics B - Proceedings Supplements　119　389-391　2003

    Publisher: Elsevier

    DOI： 10.1016/S0920-5632(03)01563-9 　

    ISSN： 0920-5632

  85. Bayesian approach to the first excited nucleon state in lattice QCD

    S. Sasaki, K. Sasaki, T. Hatsuda, M. Asakawa

    Nuclear Physics B - Proceedings Supplements　119　302-304　2003

    Publisher: Elsevier

    DOI： 10.1016/S0920-5632(03)01545-7 　

    ISSN： 0920-5632

  86. Nucleon axial charge from quenched lattice QCD with domain wall fermions and improved gauge action Peer-reviewed

    Shoichi Sasaki, Tom Blum, Shigemi Ohta, Kostas Orginos

    Nuclear Physics B - Proceedings Supplements　106-107　302-304　2002/03

    DOI： 10.1016/S0920-5632(01)01695-4 　

    ISSN： 0920-5632

  87. Lattice study of the nucleon excited states with domain wall fermions Peer-reviewed

    Shoichi Sasaki, Tom Blum, Shigemi Ohta

    Physical Review D - Particles, Fields, Gravitation and Cosmology　65　(7)　14　2002

    DOI： 10.1103/PhysRevD.65.074503 　

    ISSN： 1550-2368 1550-7998

    eISSN： 2470-0029

  88. Domain wall fermion calculation of nucleon gA/gV Peer-reviewed

    Tom Blum, Shigemi Ohta, Shoichi Sasaki

    Nuclear Physics B - Proceedings Supplements　94　(1-3)　295-298　2001/03

    DOI： 10.1016/S0920-5632(01)00938-0 　

    ISSN： 0920-5632

  89. The parity partner of the nucleon in quenched QCD with domain wall fermions

    Sasaki, S.

    Nuclear Physics B Proceedings Supplements　83-84　(1-3)　2000

    DOI： 10.1016/s0920-5632(00)91624-4 　

    ISSN： 0920-5632

  90. Non-perturbative renormalisation using domain wall fermions

    Dawson, C., Blum, T., Chen, P., Christ, N., Creutz, M., Fleming, G., Kaehler, A., Klassen, T., Malureanu, C., Mawhinney, R., Ohta, S., Sasaki, S., Seigert, G., Sui, C., Soni, A., Wingate, M., Vranas, P., Wu, L., Zhestkov, Yu

    Nuclear Physics B Proceedings Supplements　83-84　(1-3)　2000

    DOI： 10.1016/s0920-5632(00)91825-5 　

    ISSN： 0920-5632

  91. Topological aspect of Abelian projected SU(2) lattice gauge theory Peer-reviewed

    Shoichi Sasaki

    Physical Review D - Particles, Fields, Gravitation and Cosmology　59　(9)　1999/04/05

    DOI： 10.1103/PhysRevD.59.094507 　

    ISSN： 1550-2368 1550-7998

  92. A conclusive test of abelian dominance hypothesis for topological charge in the QCD vacuum

    Sasaki, S., Miyamura, O.

    Nuclear Physics B Proceedings Supplements　73　(1-3)　1999

    DOI： 10.1016/S0920-5632(99)85132-9 　

    ISSN： 0920-5632

  93. Lattice study of U-A(1) anomaly: the role of QCD-monopoles Peer-reviewed

    S Sasaki, O Miyamura

    PHYSICS LETTERS B　443　(1-4)　331-337　1998/12

    DOI： 10.1016/S0370-2693(98)01318-5 　

    ISSN： 0370-2693

    eISSN： 1873-2445

  94. Confinement properties in the multi-instanton system Peer-reviewed

    M Fukushima, H Suganuma, A Tanaka, H Toki, S Sasaki

    NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS　63　513-515　1998/04

    DOI： 10.1016/S0920-5632(97)00818-9 　

    ISSN： 0920-5632

    eISSN： 1873-3832

  95. Dual Ginzburg-Landau theory and Quark Nuclear Physics Peer-reviewed

    H. Toki, H. Suganuma, H. Ichie, H. Monden, S. Umisedo, A. Tanaka, M. Fukushima, F. Araki, S. Sasaki

    Nuclear Physics A　629　(1-2)　63-71　1998/02/02

    DOI： 10.1016/S0375-9474(97)00667-2 　

    ISSN： 0375-9474

  96. Existence of chiral-asymmetric zero modes in the background of QCD-monopoles

    Sasaki, S., Miyamura, O.

    Nuclear Physics B Proceedings Supplements　63　(1-3)　1998

    DOI： 10.1016/S0920-5632(97)00816-5 　

    ISSN： 0920-5632

  97. Confinement Mechanism and Chiral Phase Transition in the Non-Perturbative Vacuum of QCD :

    SASAKI Shoichi, SUGANUMA Hideo, TOKI Hiroshi

    Progress of theoretical physics. Supplement　(129)　227-230　1998

    Publisher: Progress of Theoretical Physics

    DOI： 10.1143/PTPS.129.227 　

    ISSN： 0375-9687

    More details Close

    We study the relation between color confinement and chiral symmetry breaking in the background of condensed monopoles at T = 0 and T ≠ 0. We formulate the Schwinger-Dyson (SD) equation including the vacuum polarization effect, which could remove the infrared singularity, in the dual Ginzburg-Landau theory. In order to solve the SD equation at T ≠ 0, we provide a new ansatz for the quark mass function in the imaginary-time formalism. We find the existence of a strong correlation between the critical temperature T_c of the chiral symmetry restoration and the confinement quantity such as the string tension.

  98. Clustering of monopoles in the instanton vacuum Peer-reviewed

    M Fukushima, S Sasaki, H Suganuma, A Tanaka, H Toki, D Diakonov

    PHYSICS LETTERS B　399　(1-2)　141-147　1997/04

    DOI： 10.1016/S0370-2693(97)00286-4 　

    ISSN： 0370-2693

    eISSN： 1873-2445

  99. Distribution of instanton and monopole clustering Peer-reviewed

    M Fukushima, A Tanaka, S Sasaki, H Suganuma, H Toki, D Diakonov

    NUCLEAR PHYSICS B　53　494-496　1997/02

    DOI： 10.1016/S0920-5632(96)00697-4 　

    ISSN： 0550-3213

    eISSN： 1873-1562

  100. Confinement and topological charge in the abelian gauge of QCD Peer-reviewed

    H Suganuma, S Sasaki, H Ichie, F Araki, O Miyamura

    NUCLEAR PHYSICS B　528-530　1997/02

    ISSN： 0550-3213

    eISSN： 1873-1562

  101. Confinement and topological charge in the abelian gauge of QCD Peer-reviewed

    H. Suganuma, S. Sasaki, H. Ichie, F. Araki, O. Miyamura

    Nuclear Physics B - Proceedings Supplements　53　(1-3)　528-530　1997

    Publisher: Elsevier

    DOI： 10.1016/S0920-5632(96)00708-6 　

    ISSN： 0920-5632

  102. Monopole dominance for nonperturbative QCD Peer-reviewed

    H Suganuma, S Umisedo, S Sasaki, H Toki, O Miyamura

    AUSTRALIAN JOURNAL OF PHYSICS　50　(1)　233-243　1997

    DOI： 10.1071/P96045 　

    ISSN： 0004-9506

  103. Chiral symmetry breaking in the dual Ginzburg-Landau theory Peer-reviewed

    H Toki, S Sasaki, H Ichie, H Suganuma

    AUSTRALIAN JOURNAL OF PHYSICS　50　(1)　199-204　1997

    DOI： 10.1071/P96051 　

    ISSN： 0004-9506

  104. Dual Ginzburg-Landau Theory of Nonperturbative QCD Phenomena

    H. Toki, H. Suganuma, S. Sasaki, H. Ichie, H. Monden, S. Umisedo, A. Tanaka, M. Fukushima, F. Araki

    High-Energy Spin Physics (Kobe Univ. Press)　157-167　1997

  105. Dual Ginzburg-Landau Theory of Nonperturbative QCD Phenomena

    H. Toki, H. Suganuma, S. Sasaki, H. Ichie, H. Monden, S. Umisedo, A. Tanaka, M. Fukushima, F. Araki

    Quark Confinement and The Hadron Spectrum II (World Scientific)　36-48　1997

  106. Role of dual Higgs mechanism in chiral phase transition at finite temperature Peer-reviewed

    S Sasaki, H Suganuma, H Toki

    PHYSICS LETTERS B　387　(1)　145-150　1996/10

    DOI： 10.1016/0370-2693(96)01020-9 　

    ISSN： 0370-2693

    eISSN： 1873-2445

  107. Dual Ginzburg-Landau theory and quark nuclear physics Peer-reviewed

    H Toki, S Sasaki, H Ichie, H Monden, H Suganuma

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY　29　S346-S351　1996/09

    ISSN： 0374-4884

  108. Evidence of strong correlation between instanton and QCD-monopole on SU(2) lattice Peer-reviewed

    H Suganuma, A Tanaka, S Sasaki, O Miyamura

    NUCLEAR PHYSICS B　47　302-305　1996/03

    DOI： 10.1016/0920-5632(96)00061-8 　

    ISSN： 0550-3213

    eISSN： 1873-1562

  109. DUAL GINZBURG-LANDAU THEORY WITH QCD-MONOPOLES FOR DYNAMICAL CHIRAL-SYMMETRY BREAKING Peer-reviewed

    S SASAKI, H SUGANUMA, H TOKI

    PROGRESS OF THEORETICAL PHYSICS　94　(3)　373-384　1995/09

    DOI： 10.1143/PTP.94.373 　

    ISSN： 0033-068X

  110. COLOR CONFINEMENT, QUARK PAIR CREATION AND DYNAMICAL CHIRAL-SYMMETRY BREAKING IN THE DUAL GINZBURG-LANDAU THEORY Peer-reviewed

    H SUGANUMA, S SASAKI, H TOKI

    NUCLEAR PHYSICS B　435　(1-2)　207-240　1995/02

    DOI： 10.1016/0550-3213(94)00392-R 　

    ISSN： 0550-3213

    eISSN： 1873-1562

  111. Dual Higgs Mechanism for Quarks in Hadrons :

    SUGANUMA Hideo, SASAKI Shoichi, TOKI Hiroshi, ICHIE Hiroko

    Progress of theoretical physics. Supplement　(120)　57-73　1995

    Publisher: Progress of Theoretical Physics

    DOI： 10.1143/PTPS.120.57 　

    ISSN： 0375-9687

    More details Close

    We study nonperturbative features of QCD using the dual Ginzburg-Landau (DGL) theory, where the color confinement is realized through the dual Higgs mechanism brought by QCD-monopole condensation. The linear confinement potential appears in the QCD-monopole condensed vacuum. We study the infrared screening effect to the confinement potential by the light-quark pair creation, and derive a compact formula for the screened quark potential. We study the dynamical chiral-symmetry breaking (D_χSB) in the DGL theory by solving the Schwinger-Dyson equation. QCD-monopole condensation plays an essential role to D_χSB. The QCD phase transition at finite temperature is studied using the effective potential formalism in the DGL theory. We find the reduction of QCD-monopole condensation and the string tension at high temperatures. The surface tension is calculated using the effective potential at the critical temperature T_c. The DGL theory predicts a large mass reduction of glueballs near T_c. We apply the DGL theory to the quark-gluon-plasma (QGP) physics in the ultrarelativistic heavy-ion collisions. We propose a new scenario of the QGP formation via the annihilation of color-electric flux tubes based on the attractive force between them.

  112. MAGNETIC MONOPOLE CONDENSATION FOR CONFINEMENT AND CHIRAL-SYMMETRY BREAKING Peer-reviewed

    H TOKI, H SUGANUMA, S SASAKI

    NUCLEAR PHYSICS A　577　(1-2)　C353-C359　1994/09

    DOI： 10.1016/0375-9474(94)90880-X 　

    ISSN： 0375-9474

Show all ︎Show first 5

Misc. 37

  1. Glueball mass spectrum at finite temperature using anisotropic lattice QCD

    蟻川歳三, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　79　(1)　2024

    ISSN： 2189-079X

  2. Research on DD* scattering phase shift at low energy using lattice QCD

    長塚正人, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　79　(1)　2024

    ISSN： 2189-079X

  3. Triad representation in 4D Anisotropic Tensor Renormalization Group method

    杉本悠斗, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　79　(2)　2024

    ISSN： 2189-079X

  4. 非等方格子QCDを用いた有限温度下でのグルーボール質量変化の再考

    蟻川歳三, 佐々木勝一

    原子核研究　68　(Supplement 1)　2024

    ISSN： 0367-4169

  5. On equivalence between Yang-Mills gradient flow and stout smearing

    長塚正人, 酒井啓太, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　78　(1)　2023

    ISSN： 2189-079X

  6. Glueball mass spectrum at finite temperature using anisotropic lattice QCD

    蟻川歳三, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　78　(2)　2023

    ISSN： 2189-079X

  7. 物理点格子QCDによる核子構造の計算

    辻竜太朗, 辻竜太朗, 青木保道, 石川健一, 藏増嘉伸, 佐々木勝一, 新谷栄吾, 山崎剛

    日本物理学会講演概要集(CD-ROM)　77　(1)　2022

    ISSN： 2189-079X

  8. Proton radius measurement with low-energy electron scattering at ELPH, Tohoku University.

    本多佑記, 青柳泰平, LEGRIS Clement, 郷家大雅, 石崎一志, 菊永英寿, 前田幸重, KOHL Michael, 三浦禎雄, 宮部学, 武藤俊哉, 南部健一, 佐々木勝一, 須田利美, 高橋健, 瀧大祐, 玉江忠明, 時安敦史, 塚田暁, 和宇慶ひかり, HANG Zhao

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  9. Estimation of Spectral Functions Using Sparse Modeling Method

    長瀬伊織, KUNFELD Mandy, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  10. Performance study of electron spectrometer for Proton Radius Measurement by Low-energy Electron Scattering

    瀧大祐, 青柳泰平, LEGRIS Clement, 郷家大雅, 本多佑記, 石崎一志, 菊永英寿, 前田幸重, KOHL Michael, 三浦禎雄, 宮部学, 武藤俊哉, 南部健一, 佐々木勝一, 須田利美, 高橋健, 玉江忠明, 時安敦史, 塚田暁, 和宇慶ひかり, HANG Zhao

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

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  11. 核子中クォークが担う運動量及びヘリシティ割合の物理点格子QCD計算

    辻竜太朗, 青木保道, 石川健一, 藏増嘉伸, 佐々木勝一, 新谷栄吾, 山崎剛

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

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  12. Glueball spectroscopy through the Yang-Mills gradient flow method in lattice QCD: III

    酒井啓太, 佐々木勝一

    日本物理学会講演概要集(CD-ROM)　76　(1)　2021

    ISSN： 2189-079X

  13. 核子軸性電荷及びテンソル,スカラー荷の物理点格子QCD計算

    辻竜太朗, 青木保道, 石川健一, 藏増嘉伸, 佐々木勝一, 新谷栄吾, 山崎剛

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

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  14. Towards the proton radius measurement by low-energy electron scattering

    郷家大雅, 青柳泰平, HANG Z., 本多佑記, 石倉悠真, 石崎一志, 菊永英寿, LEGRIS C., 前田幸重, MICHAEL K., 三浦禎雄, 宮部学, 武藤俊哉, 南部健一, 佐々木勝一, 須田利美, 高橋健, 瀧大祐, 玉江忠明, 時安敦史, 塚田暁, 和宇慶ひかり

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

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  15. Precise measurement of the proton charge radius at ELPH 2

    Honda Y., Sasaki S., Suda T., Takahashi K., Takayama S., Tamae T., Tokiyasu A. O., Tsukada K., Tsukamoto N., Aoyagi T., Kasama K., Kikunaga H., Maeda Y., Miyabe M., Muto T., Namba K., Nanbu K.

    Meeting Abstracts of the Physical Society of Japan　73　82-82　2018

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.73.1.0_82 　

  16. A design of an electron spectrometer for proton radius measurements at ELPH

    Aoyagi T., Sasaki S., Suda T., Takahashi K., Tamae T., Tokiyasu A., Tsukada K., Tsukamoto N., Honda Y., Kasama K., Kikunaga H., Maeda Y., Miyabe M., Muto T., Namba K., Nanbu K.

    Meeting Abstracts of the Physical Society of Japan　73　258-258　2018

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.73.1.0_258 　

  17. 格子上のベーテ・サルピータ振幅に基づくチャームクォークの質量の評価

    野地和希, 河内太一, 佐々木勝一

    原子核研究　62　(Supplement 1)　2018

    ISSN： 0367-4169

  18. ELPHでの電子弾性散乱による陽子荷電半径精密測定

    本多佑記, 菊永英寿, 南部健一, 宮部学, 武藤俊哉, 佐々木勝一, 須田利美, 高橋健, 玉江忠明, 時安敦史, 塚田暁, 塚本夏基

    日本物理学会講演概要集(CD-ROM)　72　(2)　2017

    ISSN： 2189-079X

  19. 陽子電荷半径パズル解明にむけて-極低運動量移行領域での電子・陽子弾性散乱-

    須田利美, 菊永英寿, 塚田暁, 本多佑記, 玉江忠明, 武藤俊哉, 高橋健, 宮部学, 時安敦史, 佐々木勝一, 塚本夏基

    日本物理学会講演概要集(CD-ROM)　72　(2)　2017

    ISSN： 2189-079X

  20. e-p散乱実験の解析における不定性

    塚本夏基, 佐々木勝一

    原子核研究　61　(Supplement 1)　2017

    ISSN： 0367-4169

  21. 格子QCDを用いたチャーモニウムの構造研究

    野地和希, 河内太一, 佐々木勝一

    原子核研究　61　(Supplement 1)　2017

    ISSN： 0367-4169

  22. 計算核物理

    根村英克, 清水則孝, 阿部喬, 江尻信司, 古本猛憲, 堀内渉, 板垣直之, 藏増嘉伸, 中務孝, 佐々木勝一, 住吉光介, 大西明

    原子核研究　57　(Supplement 2)　2013

    ISSN： 0367-4169

  23. 12aSD-1 New derivation of QCD sum rules based on commutation relations : Application to fluctuation of QCD vacuum

    Hayata Tomoya, Hatsuda Tetsuo, Sasaki Shoichi

    Meeting abstracts of the Physical Society of Japan　67　(2)　35-35　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  24. 27aXD-2 Nucleon structure from 2+1f dynamical DWF lattice QCD at nearly physical pion mass

    Aoki Yasumichi, Blum Tom, Izubuchi Taku, Jung Chulwoo, Lin Meifeng, Ohta Shigemi, Sasaki Shoichi, Yamazaki Takeshi

    Meeting abstracts of the Physical Society of Japan　67　(1)　113-113　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  25. 26pXD-10 Hadron scattering with charmonium and bottomonium from lattice QCD

    Ozaki Sho, Sasaki Shoichi, Hatsuda Tetsuo

    Meeting abstracts of the Physical Society of Japan　67　(1)　62-62　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  26. 16aSC-4 Hyperon beta decays from 2+1 flavor lattice QCD

    Sasaki Shoichi

    Meeting abstracts of the Physical Society of Japan　66　(2)　3-3　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  27. 16pSG-9 J/ψ-φ Scattering and Y(4140) on the Lattice QCD

    Ozaki Sho, Sasaki Shoichi, Hatsuda Tetsuo

    Meeting abstracts of the Physical Society of Japan　66　(2)　70-70　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  28. 25pGE-3 Hyperon beta decays from 2+1 flavor lattice QCD

    Sasaki Shoichi

    Meeting abstracts of the Physical Society of Japan　66　(1)　5-5　2011/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  29. 23pBC-11 Study of charmonium-nucleon interaction in lattice QCD

    Kawanai T., Sasaki S., Hatsuda T.

    Meeting abstracts of the Physical Society of Japan　65　(1)　64-64　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  30. 20pSK-15 SU(3) breaking effect in hyperon beta decay

    Sasaki Shoichi, Yamazaki Takeshi

    Meeting abstracts of the Physical Society of Japan　63　(2)　4-4　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  31. 24pZC-4 Nucleon form factor from 2+1 flavour lattice QCD

    Sasaki Shoichi, Yamazaki Takeshi, RBC+UKQCD Collaborations

    Meeting abstracts of the Physical Society of Japan　63　(1)　9-9　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  32. 28aWG-11 Strange dibaryons and tribaryons as multi-quark states

    Maezawa Yuu, Hatsuda Tetsuo, Sasaki Shoichi

    Meeting abstracts of the Physical Society of Japan　61　(1)　40-40　2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  33. 有効ポテンシャルの方法によるDGL理論におけるカイラル対称性の自発的破れ(非摂動的量子色力学-QCDの真空構造,研究会報告)

    海勢頭 聖, 菅沼 秀夫, 土岐 博, 佐々木 勝一

    素粒子論研究　95　(5)　E12-E13　1997/08/20

    Publisher: 素粒子論グループ 素粒子研究編集部

    ISSN： 0371-1838

  34. 29p-R-8 Chiral Phase Transition at Finite Temperature in the Dual Ginzburg-Landau Theory

    佐々木 勝一, 菅沼 秀夫, 土岐 博

    日本物理学会講演概要集. 年会　50　(1)　55-55　1995/03/16

    Publisher: 一般社団法人日本物理学会

  35. Dynamical Chiral Symmetry Breaking in the dual Ginzburg-Landau theory

    Soryushiron Kenkyu　89　(6)　F24-F26　1994/09/20

    Publisher: Soryushiron Kenkyu

    ISSN： 0371-1838

  36. Color Confinement, Quark Pair Creation and Dynamical Chiral-Symmetry Breaking in the Dual Ginzburg-Landau Theory

    Soryushiron Kenkyu　89　(6)　F21-F23　1994/09/20

    Publisher: Soryushiron Kenkyu

    ISSN： 0371-1838

  37. 30p-S-11 Dynamical Chiral-Symmetry Breaking in the dual Ginzburg-Landau theory as an infrared effecive theory of QCD

    Sasaki Shouichi, Suganuma Hideo, Toki Hiroshi

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　49　(1)　23-23　1994/03/16

    Publisher: The Physical Society of Japan (JPS)

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Presentations 18

  1. Status of lattice QCD determination of nucleon form factors at the physical point and its challenge for the proton charge radius Invited

    Shoichi Sasaki

    Low-Energy Electron Scattering for Nucleon and Exotic Nuclei (LEES2024)　2024/10/29

  2. A proposal for removing πN-state contamination from the nucleon induced pseudoscalar form factor in lattice QCD

    Shoichi Sasaki, Yasumichi Aoki, Ken-Ichi Ishikawa, Yoshinobu Kuramashi, Kohei Sato, Eigo Shintani, Ryutaro Tsuji, Hiromasa Watanabe, Takeshi Yamazaki

    The 41st International Symposium on LATTICE FIELD THEORY (LATTICE 2024)　2024/07/29

  3. Nucleon form factors from lattice QCD near the physical point Invited

    Shoichi Sasaki

    Sixth Joint Meeting of the Nuclear Physics Divisions of the APS and the JPS, Hawaii, USA　2023/11/27

  4. Nucleon structure from lattice QCD on (10 fm)^4 lattices at the physical point Invited

    Shoichi Sasaki

    R-CCS workshop on “Challenges and opportunities in lattice QCD simulations and related fields”, Kobe, JAPAN

  5. 物理点 2 + 1 フレーバー格子 QCD による核子のアイソベクター結合の計算

    塚本夏基, 青木保道, 石川健一, 藏増嘉伸, 佐々木勝一, 新谷栄悟, 山崎剛

    日本物理学会 2019年秋季大会　2019/09

  6. Nucleon form factors from lattice QCD at the physical point Invited

    SASAKI Shoichi

    2019/03/20

  7. Prospects on nucleon structure by PACS Invited

    SASAKI Shoichi

    2019/02/28

  8. Nucleon form factors from lattice QCD near the physical point International-presentation Invited

    SASAKI Shoichi

    Fifth Joint Meeting of the Nuclear Physics Divisions of the APS and the JPS　2018/10/23

  9. 物理点格子QCDシミュレーションによる核子構造の研究 Invited

    佐々木 勝一

    OFP利活用報告会、5th JCAHPC Seminar　2017/10/12

  10. Nucleon structure from 2+1 flavor lattice QCD near the physical point International-presentation Invited

    SASAKI Shoichi

    CSSM International Workshop on QCD Downunder 2017　2017/07/10

  11. SU(3)-breaking effects and induced second-class form factors in hyperon beta decays from 2+1 flavor lattice QCD International-presentation

    The 33rd International Symposium on LATTICE FIELD THEORY (LATTICE 2015)　2015/07/14

  12. 格子 QCD 計算によるハイペロンβ崩壊の第二種形状因子の評価

    日本物理学会第70回年次会　2015/03/21

  13. Hyperon beta decays from 2+1 flavor dynamical DWF lattice QCD International-presentation Invited

    CCS-BNL Workshop on Lattice Gauge Theories 2015　2015/03/12

  14. Heavy quarkonium potential from Bethe-Salpeter wave function on the lattice International-presentation Invited

    Yukawa International Program: Hadrons and Hadron Iterations in QCD 2015　2015/02/15

  15. Heavy quarkonium potential from lattice QCD International-presentation Invited

    Fourth Joint Meeting of the Nuclear Physics Divisions of the APS and the JPS　2014/10/07

  16. Heavy quarkonium potential from lattice QCD International-presentation Invited

    Hadron physics symposium　2014/04/17

  17. Status of semileptonic hyperon decays from lattice QCD using 2+1 flavor domain wall fermions International-presentation

    The 31st International Symposium on LATTICE FIELD THEORY (LATTICE 2013)　2013/07/29

  18. Flavor SU(3) breaking in hyperon beta decays International-presentation Invited

    The 4th International Workshop on Lattice Hadron Physics　2012/07/02

Show all Show first 5

Research Projects 14

  1. Role of gluons in hadron structure explored by lattice QCD

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2022/04 - 2026/03

  2. 強い相互作用の第一原理計算による軽ハドロン形状因子の総合理解

    山崎 剛, 佐々木 勝一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 筑波大学

    2019/04 - 2023/03

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    強い力の特徴であるクォーク・グルーオン→核子→原子核という階層構造を統一的に扱い、第一原理計算が可能な格子QCD計算から、軽いハドロンの性質を定量的かつ総合的に理解することを目指した研究を行った。 その一つが素粒子標準模型を超える物理の探索に関係するK中間子セミレプトニック崩壊形状因子の計算である。現在、キャビボ-小林-益川クォーク混合行列要素の一つであるVusには、標準模型からの予言値と実験値にズレが示唆されており、このズレの検証が急がれている。本課題では、一辺が10fmを超える大体積かつ現実的クォーク質量で生成されたゲージ配位(PACS10配位)を用いて、K中間子セミレプトニック崩壊実験からVusを決定するために必要なK中間子崩壊形状因子の高精度計算を実施した。0.6%誤差でVusを決定した以前の研究結果に加え、格子間隔を小さくした計算結果を取り入れた解析により連続極限での形状因子を求めた。その結果を用いて決定したVusは、以前よりも小さな誤差で得られた。現状では、我々の結果を用いたVusの値は標準模型の予言値と無矛盾な結果となっている。 核子形状因子研究についてはPACS10配位を用いた継続計算から、以前の研究で明らかになった核子荷電半径に含まれる系統誤差の原因は、有限格子間隔依存性によるものである可能性が高まった。しかし、以前の結果との定性的な違いも見えているため、より詳細な解析が必要になると考えられる。また、荷電半径などに関係する形状因子の微分を直接計算する方法の開発研究を行い、核子形状因子計算へこの方法を適用した。その結果、関数形を仮定したフィットから荷電半径を求める従来の方法よりも、統計誤差と系統誤差を合わせた不定性で比較すると、精度が向上する可能性があることを示した。 これらの研究成果は学術雑誌Physical Review Dや国際会議報告などで発表した

  3. Nucleon structure from lattice QCD

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2018/04 - 2022/03

  4. Fundamental study towards understanding of nucleus structure from Quantum Chromodynamics

    Yamazaki Takeshi, NAMEKAWA Yusuke, KURAMASHI Yoshinobu, SASAKI Shoichi, ISHIKAWA Ken-ichi, SHINTANI Eigo, KAKAZU Junpei, TSUKAMOTO Natsuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: University of Tsukuba

    2016/04 - 2019/03

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    The final goal of this project is to quantitatively understand the properties of nuclei, such as their mass and structure, from the first principle calculation of Quantum Chromodynamics (QCD), i.e., lattice QCD, which can directly calculate the characteristic structure of QCD, such as quark and gluon→nucleon→nucleus. We calculated the binding energy of the deuteron, which has the smallest mass number, because the nucleus study from lattice QCD is at an initial stage. The result is in good agreement with the expected value from the experiment, although the error is still large. It is an encouraging result to lay the foundation of the nucleus study from lattice QCD. Furthermore, we carried out calculations for the pion and nucleon form factors, which can be regarded as a pilot study for nucleus structure calculation. The results from those calculations agree with the experiments. Moreover, we proposed a new method to calculate scattering amplitudes using lattice QCD.

  5. Research on quantum simulations out of equlibrium

    Fukushima Kenji, BENIC Sanjin, PU Shi, MURASE Koichi, OKA Takashi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: The University of Tokyo

    2015/04 - 2018/03

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    The problem of real-time evolution with quantum fluctuations has universal relevance for establishing descriptions for realistic physics phenomena. This is a very important problem, and nevertheless, no general and nonperturbative algorithm at work is known, especially for relativistic quantum field theory. For the purpose to attack this problem, we investigated the sign problem, fixed point structures of the Boltzmann equation, particle production calculations, transport coefficient estimations including resummed diagrams. In this way we took the approaches from various perspectives, to find concrete answers for respective problems.

  6. Nuclear Structure based on Quark Dynamics

    HATSUDA Tetsuo, OTSUKA Takaharu, NAKAMURA Atsushi, AOKI Sinya, NAKATSUKASA Takashi, FUJII Shinichiro, HIYAMA Emiko, SHIMIZU Noritaka, SASAKI Shoichi, YABANA Kazuhiro, TAKANO Masatoshi, NEMURA Hidekatsu, SUZUKI Toshio, ISHII Noriyoshi, FUJII Shinichiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: The University of Tokyo

    2008 - 2012

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    To derive the nuclear force from first principle lattice quantum chromo dynamics (QCD) simulations, HAL QCD method was developed and established. The equation of state for asymmetric nuclear matter at finite temperature, which is the key input for describing the supernova explosion, was derived on the basis of the cluster variational method. Also, a reduction formula for the Wilson-fermion determinant necessary to study the phase structure of dense QCD was derived. The Gaussian expansion method for quantum few-body calculation was extended to five-body systems with arbitrary two-body interactions. The Monte Carlo shell model, which is powerful method to study the nuclear Hamiltonian with large dimension, was further developed by improving the numerical argorithm and by introducing a new extrapolation method on the basis of the energy variance. A new code of time-dependent density functional theory with particle paring was developed: It lead to a few orders of magnitude numerical speed-up and was applied to study various nuclear collective motions.

  7. 現実的な2+1フレーバー格子QCDによるハイペロンβ崩壊の精密計算 Competitive

    佐々木勝一

    Offer Organization: 文部科学省

    System: 科学研究費補助金(新学術領域研究(研究領域提案型))

    2011 - 2011

  8. 格子QCDによる重いクォークを含むエキゾチックなハドロン原子核系の研究 Competitive

    佐々木勝一

    Offer Organization: 文部科学省

    System: 科学研究費補助金(基盤研究(C))

    2011 - 2011

  9. チャーモニウム原子核の可能性を探る Competitive

    佐々木勝一

    Offer Organization: 文部科学省

    System: 科学研究費補助金(新学術領域研究(研究領域提案型))

    Category: 新学術領域研究(研究領域提案型)

    Institution: 東京大学

    2009 - 2010

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    チャーモニウムと核子との間には、構成するクォークのフレーバーの違いから、クォーク交換に伴う相互作用が存在せず、主に多重グルーオン交換による相互作用、所謂カラー・ファンデルワールス力が支配的になると考えられる。そのため、核子多体系である原子核に対して、チャーモニウムはパウリ排他律に由来される短距離斥力効果を全く感じず、核子とのカラー・ファンデルワールス力が常に引力であることからチャーモニウムが原子核に束縛される可能性が高い。しかしながら、実際に束縛させるためにどのくらい大きな核子数の原子核が必要かは、核子-チャーモニウム間の二体相互作用の詳細に強く依ってくる。本研究では格子QCD数値解析により、核子-チャーモニウム間相互作用について研究を行った。今年度は、クォークの真空偏極を無視したクェンチ近似で、且つクォークの質量がパイオンの質量に換算して0.5-0.8GeVの比較的重いクォーク質量を用いた予備計算を行い、まず核子-チャーモニウム間ポテンシャルの導出に成功し、チャーモニウムが原子核に束縛されるための必要条件、「チャーモニウムと核子の間の相互作用がその相対距離に依らず常に引力的であること」をQCDの第一原理計算から確認できた。また、QEDの場合荷電中性粒子間に働くファンデルワールス力は摂動論により距離の逆ベキに比例する長距離力となることが知られているが、我々の数値計算によって得...

  10. Lattice study of hadron structure and strangness contribution Competitive

    Shoichi SASAKI

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(C))

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: The University of Tokyo

    2007 - 2010

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    The latest lattice QCD calculations are progressing with steadily increasing accuracy due to the rapid development of the computer and the numerical algorithm. Fully dynamical QCD simulations with two degenerate light (up and down) and heavier (strange) flavors of quarks have been mostly devoted to studies of the hadron structure by the worldwide lattice QCD community during the past several years. In this study, we take advantage of 2+1 flavor dynamical QCD gauge configurations, which are publicly available to lattice QCD community through ILDG (International Lattice Data Grid) and then st...

  11. Dynamical Structure of the Quark-Gluon Plasma based on Lattice QCD with Bayesian Statistics

    HATSUDA Tetsuo, EJIRI Shinji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: The University of Tokyo

    2003 - 2005

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    Inside the quark-gluon plasma, the quark-anti-quark potential becomes weak due to the thermal Debye screening. As a result, the bound states composed of heavy-quarks melt down above certain critical temperature. However, the precise relation between the melting temperature and the critical temperature of the confinement-deconfinement phase transition. We have carried out lattice QCD simulations to answer this problem and have found that heavy charmonium such as J/Psi can survive even up to 1.7 times the critical temperature. The large volume simulations as well as the use of the Bayesian statistics play essential role in this study. In the interior of the neutron stars and quark stars, there may exist quark matter composed of deconfined quarks. Since there is always an attractive channel in the quark-quark interaction at the Fermi surface, quark matter is in the color superconducting state. We have carried our Ginzburg-Landau analysis of the phase transition between the color superconducting state and the normal state and found that the phase transition is driven to first order due to the thermal fluctuation of the gluons. We have applied the maximum entropy method to analyses the excited baryon spectra calculated on the lattice. It was found that the method can extract the position of the positive and negative excited states of the nucleon correctly. Also, the method is powerful enough to separate the physical spectra and the unphysical spectra due to lattice discretization.

  12. 格子QCD数値計算によるバリオン励起状態の研究 Competitive

    佐々木勝一

    Offer Organization: 文部科学省

    System: 科学研究費補助金(若手研究(B))

    Category: 若手研究(B)

    Institution: 東京大学

    2003 - 2005

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    1)日本の実験グループ(LEPS collaboration)によって発見された正のストレンジネス(S=+1)を持つエキゾッチクなバリオン、"ペンタクォーク"状態Θ(1540)に関する格子QCDを用いた研究を世界に先駆けて行った。未だ、実験的に確定していないペンタクォークの量子数(スピン、パリティ、アイソスピン)に関して、格子QCD数値実験を用いてその量子数を予言した。また、負のチャーム(C=-1)を持つエキゾチックなバリオンΘcの存在に関しても数値実験して、その質量が多くの現象論模型で予測されている程軽くはなく、むしろ核子・D中間子の崩壊閾値よりもはるかに重いことから、Θ(1540)のように寿命の長い共鳴状態ではなく、かなり寿命の短い共鳴状態の可能性が高いことを報告した。2)格子QCD数値実験において、核子励起状態、Δ粒子励起状態(スピン1/2および3/2、正負パリティ状態)について詳細に有限体積効果の研究を行った。基底状態に比べ、励起状態に対する有限体積効果は無視できないくらい大きく、また、Δ粒子の有限体積効果は核子のそれとは逆に働くことが判明した。その原因が核子-Δ粒子の質量差における超微細構造相互作用の有限体積効果に起因している可能性を指摘した。3)高エネルギー研究機構の4H(K-,N)反応実験(KEK-PS E471)で発見された、ストレンジネスをもったトライバリオ...

  13. 格子QCD数値計算によるカイラル対称性と核子の諸性質に関する研究 Competitive

    佐々木勝一

    Offer Organization: 文部科学省

    System: 科学研究費補助金(奨励研究(A), 若手研究(B))

    Category: 若手研究(B)

    Institution: 東京大学

    2001 - 2002

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    1)中性子ベータ崩壊定数は格子QCD数値実験を用いた核子構造関数の研究をする上でその数値計算の信頼度の指標となる重要な物理量である。しかしながら長年、格子QCD数値実験では実験値を再現することができなかった。この問題に対してカイラル対称性を厳密に格子上で取り扱うことのできる新しいフェルミオンの定式化:Domain Wall Fermionを用いて取り組んだ。この中性子崩壊定数は軸性カレントを核子状態で挟んだ行列要素として定義されることからも推察できるようにカイラル対称性の自発的破れに伴う南部-ゴールドストンボソン(パイオン)と直接結合する行列要素である。このことからパイオンのコンプトン散乱長さよりも充分大きな物理的な空間サイズを用いて数値実験をしなければ実験値を再現できないことを示し、核子構造関数の数値実験における、有限体積効果の考慮の重要性を指摘した。2)核子と全く同じ量子数を持つ放射励起状態(ローパー共鳴)のような場合は、ハドロンの虚時間2点相関関数の虚時間遠方での振るまいからハドロンの質量を求めるという従来からの方法では難しい。本研究では、最近の発展著しい最大エントロピー法を活用して、格子QCD数値計算によってもたらされたハドロンの虚時間2点相関関数から直接ハドロンのスペクトル関数を導出することに成功した。得られたスペクトラル関数の解析により、ローパー共鳴状態はクォーク...

  14. 非摂動論的QCD真空におけるカイラル力学

    佐々木 勝一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 京都大学

    1998 - 1998

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