Light quark masses from unquenched lattice QCD

Details Light quark masses from unquenched lattice QCD Light quark masses from unquenched lattice QCD

2007-04-16

arxiv.org/abs/0704.1937v2

Phys.Rev.D78:011502,2008

Physics

High Energy Physics

High Energy Physics - Lattice

4 pages, 3 figures, revtex4; v2: contents partly modified, published version

Scientific paper

10.1103/PhysRevD.78.011502

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^2~0.005, 0.01 and 0.015 fm^2, and the continuum limit is taken assuming an O(a^2) discretization error. The light meson spectrum is consistent with experiment. The up, down and strange quark masses in the \bar{MS} scheme at 2 GeV are \bar{m}=(m_{u}+m_{d})/2=3.55^{+0.65}_{-0.28} MeV and m_s=90.1^{+17.2}_{-6.1} 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.

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