Finite density QCD with chiral invariant four-fermion interactions

Details Finite density QCD with chiral invariant four-fermion interactions Finite density QCD with chiral invariant four-fermion interactions

1997-04-21

arxiv.org/abs/hep-lat/9704010v1

Phys.Rev. D56 (1997) 5596-5604

Physics

High Energy Physics

High Energy Physics - Lattice

18 pages, RevTeX, 12 figures using epsf.sty

Scientific paper

10.1103/PhysRevD.56.5596

A mean field analysis of finite density QCD is presented including the effects of additional chiral invariant four-fermion interactions. A lattice regularization is used with N_f=4 flavors of staggered fermions. The use of the four-fermion coupling as an improved extrapolation parameter over the bare quark mass in Monte Carlo simulations is discussed. Particular attention is given to the structure of the phase diagram and the order of the chiral phase transition. At zero gauge coupling, the model reduces to a Nambu-Jona-Lasinio model. In this limit the chiral phase transition is found to be second-order near the zero-density critical point and otherwise first-order. In the strong gauge coupling limit a first-order chiral phase transition is found. In this limit the additional four-fermion interactions do not qualitatively change the physics. The results agree with previous studies of QCD as the four-fermion coupling vanishes.

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