Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.122002
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Funding
- IBM System Blue Gene Solution at High Energy Accelerator Research Organization (KEK) [09-05]
- Japanese Ministry of Education [19540286, 20105001, 20105002, 20105003, 20105005, 20340047, 21684013]
- Grants-in-Aid for Scientific Research [20105002, 21674002, 21684013, 20340047, 19540286, 20105005] Funding Source: KAKEN
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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(3) x 48 lattice at a lattice spacing similar to 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) over bar)(2 GeV) = [242(04)(+ 19 -18) MeV](3) where the errors are statistical and systematic, respectively.
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