Lattice study of meson correlators in the epsilon-regime of two-flavor QCD

Details Lattice study of meson correlators in the epsilon-regime of two-flavor QCD Lattice study of meson correlators in the epsilon-regime of two-flavor QCD

2007-11-30

arxiv.org/abs/0711.4965v3

Phys.Rev.D77:074503,2008

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages, 12 figures, final version to appear in PRD

Scientific paper

10.1103/PhysRevD.77.074503

We calculate mesonic two-point functions in the epsilon-regime of two-flavor QCD on the lattice with exact chiral symmetry. We use gauge configurations of size 16^3 32 at the lattice spacing a \sim 0.11 fm generated with dynamical overlap fermions. The sea quark mass is fixed at \sim 3 MeV and the valence quark mass is varied in the range 1-4 MeV, both of which are in the epsilon-regime. We find a good consistency with the expectations from the next-to-leading order calculation in the epsilon-expansion of (partially quenched) chiral perturbation theory. From a fit we obtain the pion decay constant F=87.3(5.6) MeV and the chiral condensate Sigma^{MS}=[239.8(4.0) MeV ]^3 up to next-to-next-to-leading order contributions.

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