Determination of the Chiral Condensate from (2+1)Flavor Lattice QCD
Abstract
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}×48 lattice at a lattice spacing ∼0.11fm. At the lightest sea quark mass, the finite volume system on the lattice is in the γ regime. By matching the lowlying eigenvalue spectrum of the Dirac operator with the prediction of chiral perturbation theory at the nexttoleading order, we determine the chiral condensate in (2+1)flavor QCD with strange quark mass fixed at its physical value as Σ^{MS̄}(2GeV)=[242(04)((+19)/(18))MeV]^{3} where the errors are statistical and systematic, respectively.
 Publication:

Physical Review Letters
 Pub Date:
 March 2010
 DOI:
 10.1103/PhysRevLett.104.122002
 arXiv:
 arXiv:0911.5555
 Bibcode:
 2010PhRvL.104l2002F
 Keywords:

 12.38.Gc;
 11.15.Ha;
 11.30.Rd;
 Lattice QCD calculations;
 Lattice gauge theory;
 Chiral symmetries;
 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 4 pages, 3 figures, errors in table 1 and fig.3 corrected. Published in PRL