Model analysis on thermal UV-cutoff effects on the critical boundary in hot QCD
Journal
Physical Review
Journal Volume
D81
Pages
071501
Date Issued
2009-12
Author(s)
Abstract
We study the critical boundary on the quark-mass plane associated with the chiral phase transition in QCD at finite temperature. We point out that the critical boundaries obtained from the lattice QCD simulation and the chiral effective model are significantly different; in the (Polyakov-loop coupled) Nambu-Jona-Lasinio (NJL) model we find that the critical mass is about 1 order of magnitude smaller than the value reported in the lattice QCD case. The lattice QCD study yields smaller critical mass in the continuum limit along the temporal direction. To investigate the temporal UV-cutoff effects quantitatively, we consider the (P)NJL model with only finite Matsubara summation Nτ. We confirm that the critical mass in such a UV-tamed NJL model becomes larger with decreasing Nτ, which demonstrates a correct tendency to explain the difference between the lattice QCD and chiral model results. © 2010 The American Physical Society.
Type
journal article