Lattice QCD simulation at the physical point and calculations of the proton decay matrix element

2010 Fiscal Year Final Research Report

• Project/Area Number: 20740123
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of Tsukuba
• Principal Investigator: UKITA Naoya University of Tsukuba, 計算科学研究センター, 研究員 (50422192)
• Project Period (FY): 2008 – 2010
• Keywords: 素粒子(理論) / 格子QCD

Research Abstract

This project aims to simulate 2+1 flavor lattice QCD on the physical point and to calculate observables at the physical point. The most popular strategy to obtain the result at the physical point is chiral extrapolation with the use of chiral perturbation theory as a guiding principle. This strategy, however, has large systematic errors from chiral extrapolation due to the nontrivial quark mass dependence. In this work, we have achieved the physical point simulation, which has been the long-standing problem in lattice QCD, to remove systematic errors from chiral extrapolation and to calculate observables more precisely.

Research Products

• [Journal Article] Electromagnetic form factor of pion from Nf=2+1 dynamical flavor QCD (2011)
  • Author(s): O.H.Nguyen, K.-I.Ishikawa, A.Ukawa, N.Ukita
  • Journal Title: JHEP 1104 122 Pages: 1-28
  • Peer Reviewed
• [Journal Article] hysical Point Simulation in 2+1 Flavor Lattice QCD (2010)
  • Author(s): S.Aoki, K.-I.Ishikawa, N.Ishizuka, T.Izubuchi, D.Kadoh, K.Kanaya, Y.Kuramashi, Y.Namekawa, M.Okawa, Y.Taniguchi, A.Ukawa, N.Ukita, T.Yamazaki, T.Yoshie
  • Journal Title: Phys.Rev.D81 074503 Pages: 1-5
  • Peer Reviewed
• [Journal Article] SU(2) and SU(3) chiral perturbation theory analyses on baryon masses in 2+1 flavor lattice QCD (2009)
  • Author(s): K.-I.Ishikawa, N.Ishizuka, T.Izubuchi, D.Kadoh, K.Kanaya, Y.Kuramashi, Y.Namekawa, M.Okawa, Y.Taniguchi, A.Ukawa, N.Ukita, T.Yoshie
  • Journal Title: Phys.Rev.D80 054502 Pages: 1-17
  • Peer Reviewed
• [Journal Article] 2+1 Flavor Lattice QCD toward the Physical Point (2009)
  • Author(s): S.Aoki, K.-I.Ishikawa, N.Ishizuka, T.Izubuchi, D.Kadoh, K.Kanaya, Y.Kuramashi, Y.Namekawa, M.Okawa, Y.Taniguchi, A.Ukawa, N.Ukita, T.Yoshie
  • Journal Title: Phys.Rev.D79 034503 Pages: 1-33
  • Peer Reviewed
• [Presentation] クローバーフェルミオンを用いたNf=2+1格子QCDでの核子の軸性ベクトル結合定数 (2009)
  • Author(s): 浮田尚哉
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 甲南大学岡本キャンパス
  • Year and Date: 2009-09-12
• [Presentation] Nucleon axial charge in 2+1 flavor lattice QCD with 0(a) improved Wilson quark action (2009)
  • Author(s): N.Ukita
  • Organizer: Lattice 2009
  • Place of Presentation: Beijing China.
  • Year and Date: 2009-07-27
• [Presentation] 2+1 flavor lattice QCD simulation with 0(a)-improved Wilson quarks (2008)
  • Author(s): N.Ukita
  • Organizer: LATTICE 2008
  • Place of Presentation: Regensburg Germany.
  • Year and Date: 2008-07-14
• [Remarks] ホームページ等