From the overlap lattice quark propagator calculated in the Landau gauge, we determine the quark chiral condensate by fitting operator product expansion formulas to the lattice data. The quark propagators are computed on domain wall fermion configurations generated by the RBC-UKQCD Collaborations with Nf=2+1 flavors. Three ensembles with different light sea quark masses are used at one lattice spacing 1/a=1.75(4) GeV. We obtain ⟨ψˉψ⟩MS(2\mboxGeV)=(−305(15)(21)\mboxMeV)3 in the SU(2) chiral limit.
@article{arxiv.1612.04579,
title = {Quark chiral condensate from the overlap quark propagator},
author = {Chao Wang and Yujiang Bi and Hao Cai and Ying Chen and Ming Gong and Zhaofeng Liu},
journal= {arXiv preprint arXiv:1612.04579},
year = {2017}
}