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Determination of the chiral condensate from 2+1-flavor lattice QCD · Around

2009

Determination of the chiral condensate from 2+1-flavor lattice QCD

The JLQCD collaboration, Fukaya, H., Aoki, S. et al.

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We perform a precise calculation of the chiral condensate in QCD using lattice QCD with 2+1 flavors of dynamical overlap quarks.

Up and down quark masses cover a range between 3 and 100 MeV on a 16^3x48 lattice at a lattice spacing around 0.11 fm.
At the lightest sea quark mass, the finite volume system on the lattice is in the epsilon-regime.
By matching the low-lying eigenvalue spectrum of the Dirac operator with the prediction of chiral perturbation theory at the next-to-leading order, we determine the chiral condensate in 2+1-flavor QCD with strange quark mass fixed at its physical value as Sigma (MS-bar at 2 GeV) = [242(04)(^+19_-18}) MeV}]^3, where the errors are statistical and systematic, respectively.

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