Research and development for algorithms devices of quantum field theories towards the next generation super computer

2008 Fiscal Year Final Research Report

• Project/Area Number: 19740134
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kanazawa University
• Principal Investigator: IZUBUCHI Taku Kanazawa University, 自然科学研究科, 研究協力員 (60324068)
• Project Period (FY): 2007 – 2008
• Keywords: 格子場の理論 / 素粒子物理 / 大規模シミュレーション

Research Abstract

場の量子論の大規模数値計算の新しい計算手法の研究開発を行った。まず、真空角度が入った量子色力学(QCD)配位生成の新しい手法を開発し、実際にトポロジー電荷が零からずれた真空の生成に成功した。また、周期的境界条件を課した時空上で、端に非物理的な逆電場の出ない一様で十分弱い電場をシミュレーションする方法を研究し、その二つの手法を元にStrong CP問題を解明するべく、核子の電気双極子モーメントの計算を行った。この他、場の理論の計算手法の開発としてクォーク・反クォークの生成消滅が2回以上起きている量子振幅(非結合ループ)が係わる計算として、eta'中間子の質量計算を行った。通常行われている、2つのクォークループ間の相関関数を測る方法の他に、QCD配位生成段階でループの片方をモンテカルロの生成確率に押し込めてしまう新たな計算手法を試し、両者で互いに無矛盾な結果を出すことを確かめ、eta'中間子をはじめその他の中間子の質量を求めた。これらの基本となる動的アップ、ダウン、ストレンジクォークの効果を入れたドメインオールQCD のシミュレーションを行い、素粒子標準モデルのパラメータを精度よく決定した。

Research Products

• [Journal Article] Isospin symmetry breaking effects in the pion and nucleon masses (2008)
  • Author(s): Ran Zhou, Thomas Blum, Takumi Doi, Masashi Hayakawa, Taku Izubuchi, Norikazu Yamada
  • Journal Title: PoS LAT2008 (掲載予定) Pages: 7
• [Journal Article] The electric dipole moment of the nucleon from simulations at imaginary vacuum angle theta (2008)
  • Author(s): R. Horsley, T. Izubuchi, Y. Nakamura, D. Pleiter, P.E.L. Rakow, G. Schierholz, J. Zanotti
  • Journal Title: arXiv 0808.1428[hep-lat]
• [Journal Article] Physical Results from 2+1 Flavor Domain Wall QCD and SU(2) Chiral Perturbation Theory (2008)
  • Author(s): C. Allton, D.J. Antonio, Y. Aoki, T. Blum, P.A. Boyle, N.H. Christ, S.D. Cohen, M.A. Clark, C. Dawson, M.A. Donnellan, J.M. Flynn, A. Hart, T. Izubuchi, A. Juttner, C. Jung, A.D. Kennedy, R.D. Kenway, M. Li, S Li, M.F. Lin, R.D. Mawhinney, CM. 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
  • Journal Title: Phys. Rev. D78 Pages: 114509(60pages)
  • Peer Reviewed
• [Journal Article] \eta' meson from two flavor dynamical domain wall fermions (2008)
  • Author(s): Koichi Hashimoto and Taku Izubuchi
  • Journal Title: Prog. Theor. Phys. 119 Pages: 599-641(42pages)
• [Journal Article] Non-perturbative renormalization of quark bilinear operators and $B_K$ using domain wall fermions (2008)
  • Author(s): Y.Aoki, P.A.Boyle, N.H.Christ, C.Dawson, M.A.Donnellan, T.Izubuchi, A.Juttner, S.Li, R.D.Mawhinney, J.Noaki, C.T.Sachrajda, A.Soni, R.J.Tweedie, A.Yamaguchi
  • Journal Title: Phys.Rev. D78 Pages: 054510(28pages)
  • Peer Reviewed
• [Journal Article] K to pi semileptonic form factor with 2+1 flavor domain wall fermions on the lattice (2008)
  • Author(s): D.J. Antonio, P.A. Boyle, R.J. Tweedie, J.M. Zanotti, C. Dawson, T. Izubuchi, A. Juttner, C.T. Sachrajda, S. Sasaki, A. Soni
  • Journal Title: PoS KAON 010
• [Journal Article] Neutral kaon mixing from 2+1 flavor Domain Wall QCD (2008)
  • Author(s): D.J.Antonio, P.A.Boyle, T.Blum, N.H. Christ, S.D. Cohen, C.Dawson, T.Izubuchi, R.D.Kenway, C.Jung, S.Li, M.F.Lin, R.D.Mawhinney, J.Noaki, S.Ohta, B.J.Pendleton, E.E.Scholz, A.Soni, R.J.Tweedie, A.Yamaguchi
  • Journal Title: Phys. Rev. Lett. 100 Pages: 032001(4pages)
  • Peer Reviewed
• [Journal Article] Determination of light quark masses from the electromagnetic splitting of pseudoscalar meson masses computed with two flavors of domain wall fermions (2007)
  • Author(s): Thomas Blum, Takumi Doi, Masashi Hayakawa, Taku Izubuchi, Norikazu Yamada
  • Journal Title: Phys. Rev. D76 Pages: 114508(38pages)
  • Peer Reviewed
• [Journal Article] 2+1 flavor domain wall QCD on a (2fm)$^3$ lattice: light meson spectroscopy with Ls=16 (2007)
  • Author(s): 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.Juttner, 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
  • Journal Title: Phys. Rev. D76 Pages: 014504(18pages)
  • Peer Reviewed
• [Journal Article] Perturbative renormalization for static and domain-wall bilinears and four-fermion operators with improved gauge actions (2007)
  • Author(s): Oleg Loktik, Taku Izubuchi
  • Journal Title: Phys. Rev. D75 Pages: 034504(11pages)
  • Peer Reviewed
• [Journal Article] First results from 2+1-Flavor Domain Wall QCD: Mass Spectrum, Topology Change and Chiral Symmetry with $L_s=8$ (2007)
  • Author(s): 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
  • Journal Title: Phys. Rev. D75 Pages: 114501(27pages)
  • Peer Reviewed
• [Journal Article] B- anti-B mixing with domain wall fermions in the static approximation (2007)
  • Author(s): C. Albertus, Y. Aoki, P.A. Boyle, N.H. Christ, L. Del Debbio, T.T. Dumitrescu, J.M. Flynn, T. Izubuchi, O. Loktik, C.T. Sachrajda, A. Soni, J. Wennekers
  • Journal Title: PoS LAT2007 376 Pages: 7
• [Journal Article] Dynamical QCD simulation with $\theta$ terms (2007)
  • Author(s): T.Izubuchi, S.Aoki, K.Hashimoto, Y.Nakamura, T.Sekido and G.Schierholz
  • Journal Title: PoS(LATTICE 2007) 106 Pages: 8
• [Journal Article] The Static Approximation to B Meson Mixing using Light Domain-Wall Fermions: Perturbative Renormalization and Ground State Degeneracies (2007)
  • Author(s): Norman H. Christ, Thomas T.Dumitrescu, Taku Izubuchi, Oleg Loktik
  • Journal Title: PoS(LATTICE 2007) 351 Pages: 7
• [Journal Article] Renormalization of quark bilinear operators in a MOM-scheme with a non-exceptional subtraction point
  • Author(s): C. Sturm, Y. Aoki, N.H. Christ, T. Izubuchi, C.T.C. Sachrajda, A. Soni
  • Journal Title: arXiv 0901.2599[hep-ph](掲載予定)
• [Presentation] Results of Lattice Studies by the RBRC-UKQCD Collaboration (2009)
  • Author(s): Taku Izubuchi
  • Organizer: Rencontres de Moriond QCD and High Energy Interactions
  • Place of Presentation: La Thuile, Italy
  • Year and Date: 2009-03-20
• [Presentation] The RBC/UKQCD light quark physics program: Meson result and future plans (2009)
  • Author(s): Taku Izubuchi
  • Organizer: Perspectives on Light Quark Simulations through Machine, Algorithm and ILDG
  • Place of Presentation: 筑波大学計算科学研究センター
  • Year and Date: 2009-03-10
• [Presentation] CKM and Lattice QCD (2008)
  • Author(s): Taku Izubuchi
  • Organizer: RIKEN-BNL Research Center Symposium
  • Place of Presentation: Upton, NY, USA
  • Year and Date: 2008-12-10
• [Presentation] 計算基礎科学における人材育成の現状と課題 (2008)
  • Author(s): 出渕卓
  • Organizer: 次世代スーパーコンピューティング・シンポジウム2008
  • Place of Presentation: 東京MY PLAZAホール
  • Year and Date: 2008-09-17
• [Presentation] 格子計算の新しい可能性 (2007)
  • Author(s): 出渕卓
  • Organizer: シンポジウム未来の素粒子・原子核シミュレーション
  • Place of Presentation: 筑波エポカル国際会議場
  • Year and Date: 2007-12-20
• [Presentation] Lattice QCD simulations with theta terms (2007)
  • Author(s): Taku Izubuchi
  • Organizer: RBRC Scientific Review
  • Place of Presentation: 理研BNL研究センタ
  • Year and Date: 2007-11-05
• [Presentation] Lattice QCD simulations with theta terms: Neutron EDM and eta (2007)
  • Author(s): Taku Izubuchi
  • Organizer: Wokshop "Towards the precise prediction of CP violation"
  • Place of Presentation: 京都大学基礎物理学研究所
  • Year and Date: 2007-10-24
• [Presentation] Dynamical QCD with theta terms (2007)
  • Author(s): Taku Izubuchi
  • Organizer: XXV International symposium on Lattice Field Theory
  • Place of Presentation: レーゲンスブルグ大学
  • Year and Date: 2007-08-01