Study of symmetry and nonperturbative renormalization in lattice gauge theory

2009 Fiscal Year Final Research Report

• Project/Area Number: 19540286
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyoto University
• Principal Investigator: ONOGI Tetsuya Kyoto University, 大学院・理学研究科, 教授 (70211802)
• Project Period (FY): 2007 – 2009
• Keywords: 格子ゲージ理論 / カイラル対称性 / HQET / 有効理論 / 非摂動繰りこみ

Research Abstract

Symmetries and nonperturbative renormalization are extremely useful concept in field theory. Using the nonperturbative lattice QCD simulations based on chiral symmetry, heavy quark symmetry and nonperturbative renormalization, I studied various phenomena or physical quantities which are important for field theory and particle physics phenomenology. First, we carried out the first large scale QCD simulations using a fermion formalism with exact chiral symmetry (the Overlap fermion) and determined the chiral condenstate, decay constant and the sigma term. Exploiting HQET, which is an effective theory of the heavy quark, we computed the pionic coupling of the B meson. We also proposed a new scheme for the nonperturbative gauge coupling and determined the nonperturbative running coupling.

Research Products

• [Journal Article] Determination of the chiral condensate from 2+1-flavor lattice QCD (2010)
  • Author(s): H. Fukaya, S. Aoki, S. Hashimoto, T. Kaneko, J. Noaki, T. Onogi, N. Yamada
  • Journal Title: Phys. Rev. Lett. 104 Pages: 122002
• [Journal Article] A new cheme for the running coupling constant in gauge theories using Wilson loops (2009)
  • Author(s): E. Bilgici, A. Flachi, E. Itou, M. Kurachi, C.-J.D. Lin, H. Matsufuru, H. Ohki, T. Onogi, T. Yamazaki
  • Journal Title: Phys. Rev. 80 Pages: 034507
• [Journal Article] Two-flavor simulation with exact chiral symmetry (2008)
  • Author(s): S. Aoki, H. Fukaya, S. Hashimoto, K-I. Ishikawa, K. Kanaya, T. Kaneko, H. Matsufuru, M. Okamoto, M. Okawa, T. Onogi, A Ukawa, N. Yamada, T. Yoshi (JLQCD Collaboration)
  • Journal Title: Phys. Rev. 78 Pages: 014508
• [Journal Article] S-parameter and pseudo-Nambu-Goldstone boson mass from lattice QCD (2008)
  • Author(s): E. Shintani, S. Aoki, H. Fukaya, S. Hashimoto, T. Kaneko, H. Matsufuru, T. Onogi, N. Yamada (JLQCD Collaboration)
  • Journal Title: Phys. Rev. Lett. 101 Pages: 242001
• [Journal Article] Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry (2008)
  • Author(s): H. Ohki, H. Fukaya, S. Hashimoto, T. Kaneko, H. Matsufuru, J. Noaki, T. Onogi, E. Shintani, N. Yamada (JLQCD Collaboration)
  • Journal Title: Phys. Rev. 78 Pages: 054502
• [Journal Article] Determination of B*Bpi coupling in unquenched QCD (2008)
  • Author(s): H. Ohki, H. Matsufuru, T. Onogi
  • Journal Title: Phys. Rev. 77 Pages: 094509
• [Journal Article] Topological susceptibility in two-flavor QCD with exact chiral symmetry (2008)
  • Author(s): JLQCD, TWQCD Collaborations, S. Aoki, T.W. Chiu, H. Fukaya, S. Hashimoto, T.H. Hsieh, T. Kaneko, H. Matsufuru, J. Noaki, K. Ogawa, T. Onogi, N. Yamada
  • Journal Title: Phys. Lett. 665 Pages: 294-297
• [Journal Article] Finite volume QCD at fixed topological charge (2007)
  • Author(s): S. Aoki, H. Fukaya, S. Hashimoto, T. Onogi
  • Journal Title: Phys. Rev. 76 Pages: 054508
• [Presentation] Results from lattice Q"CD with exact chiral symmetry (2010)
  • Author(s): T. Onogi
  • Organizer: invited talk at Komaba 2010 Recent Developments in Strings and Fields
  • Place of Presentation: at Univ. Tokyo, Komaba
  • Year and Date: 2010-02-13