We investigate the finite-temperature phase structure and the scaling of the chiral condensate in lattice QCD with two degenerate light quarks, using a renormalization group improved gauge action and the Wilson quark action. We obtain a phase diagram which is consistent with that from the parity-flavor breaking scenario. The scaling relation for the chiral condensate assuming the critical exponents and the scaling function of the three dimensional O(4) model is remarkably satisfied for a wide range of parameters. This indicates that the chiral transition in two flavor QCD is of second order in the continuum limit.
@article{arxiv.hep-lat/9710031,
title = {Finite-temperature chiral transitions in QCD with the Wilson quark action},
author = {S. Aoki and Y. Iwasaki and K. Kanaya and S. Kaya and A. Ukawa and T. Yoshié},
journal= {arXiv preprint arXiv:hep-lat/9710031},
year = {2009}
}