Two-flavor lattice QCD simulation in the epsilon-regime with exact chiral symmetry

Details Two-flavor lattice QCD simulation in the epsilon-regime with exact chiral symmetry Two-flavor lattice QCD simulation in the epsilon-regime with exact chiral symmetry

2007-02-02

arxiv.org/abs/hep-lat/0702003v1

Phys.Rev.Lett.98:172001,2007

Physics

High Energy Physics

High Energy Physics - Lattice

10pages, 4figures

Scientific paper

10.1103/PhysRevLett.98.172001

We perform lattice simulations of two-flavor QCD using Neuberger's overlap fermion, with which the exact chiral symmetry is realized at finite lattice spacings. The epsilon-regime is reached by decreasing the light quark mass down to 3 MeV on a 16^3 32 lattice with a lattice spacing \sim 0.11 fm. We find a good agreement of the low-lying Dirac eigenvalue spectrum with the analytical predictions of the chiral random matrix theory, which reduces to the chiral perturbation theory in the epsilon-regime. The chiral condensate is extracted as \Sigma(2 GeV) = (251(7)(11) MeV)^3, where the errors are statistical and an estimate of the higher order effects in the epsilon-expansion.

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