Light-quark masses from unquenched lattice QCD
- Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577 (Japan)
- RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801 (Japan)
- Department of Physics, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan)
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571 (Japan)
We calculate the light meson spectrum and the light quark masses by lattice QCD simulation, treating all light quarks dynamically and employing the Iwasaki gluon action and the nonperturbatively O(a)-improved Wilson quark action. The calculations are made at the squared lattice spacings at an equal distance a{sup 2}{approx_equal}0.005, 0.01, and 0.015 fm{sup 2}, and the continuum limit is taken assuming an O(a{sup 2}) discretization error. The light meson spectrum is consistent with experiment. The up, down, and strange quark masses in the MS scheme at 2 GeV are m=(m{sub u}+m{sub d})/2=3.55{sub -0.28}{sup +0.65} MeV and m{sub s}=90.1{sub -6.1}{sup +17.2} MeV where the error includes statistical and all systematic errors added in quadrature. These values contain the previous estimates obtained with the dynamical u and d quarks within the error.
- OSTI ID:
- 21250187
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 1; Other Information: DOI: 10.1103/PhysRevD.78.011502; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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