Thermodynamics of Lattice QCD with Chiral 4-Fermion Interactions
High Energy Physics - Lattice
2014-11-17 v1
Abstract
We have studied lattice QCD with an additional, irrelevant 4-fermion interaction having a U(1)xU(1) chiral symmetry, at finite temperatures. Adding this 4-fermion term allowed us to work at zero quark mass, which would have otherwise been impossible. The theory with 2 massless staggered quark flavours appears to have a first order finite temperature phase transition at N_t=4 for the value of 4-fermion coupling we have chosen, in contrast to what is expected for 2-flavour QCD. The pion screening mass is seen to vanish below this transition, only to become massive and degenerate with the sigma (f_0) above this transition where the chiral symmetry is restored, as is seen by the vanishing of the chiral condensate.
Keywords
Cite
@article{arxiv.hep-lat/9801019,
title = {Thermodynamics of Lattice QCD with Chiral 4-Fermion Interactions},
author = {J. B. Kogut and J. -F. Lagae and D. K. Sinclair},
journal= {arXiv preprint arXiv:hep-lat/9801019},
year = {2014}
}
Comments
23 pages, 11 figures