Lattice study of meson correlators in theϵ-regime of two-flavor QCD

H. Fukaya, S. Aoki, S. Hashimoto, T. Kaneko, H. Matsufuru, J. Noaki, K. Ogawa, T. Onogi, N. Yamada
2008 Physical Review D  
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 ∼ 0.11 fm generated with dynamical overlap fermions. The sea quark mass is fixed at ∼ 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
more » ... n 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.
doi:10.1103/physrevd.77.074503 fatcat:5dbi73hri5goznyt6hd6ffhlca