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"Chiral Phase Transition in a Covariant Nonlocal Nambu-Jona-Lasinio Model"
I. General, D. Gómez Dumm and N.N. Scoccola
Proc. of the "Workshop on Dynamical Aspects of the QCD Phase Transitions", ECT*, Trento, Italy, March 12-15, 2001. Ed. G.R.G. Burau, D.B. Blaschke and S.M. Schmidt
Exploring Quark Matter, Rostock 2000/Trento 2001, Rostock University Press 444-01 (2001) 163-170
The properties of the chiral phase transition at finite temperature and chemical potential are investigated within a nonlocal covariant extension of the Nambu-Jona-Lasinio model based on a separable quark-quark interaction. We consider two types of non-local regulators: a gaussian regulator and the instanton liquid model regulator. In the first case we study both the situation in which the Minkowski quark propagator has poles at real energies and the case where only complex poles appear. We find that in all the cases the behaviour of the physical quantities as functions of T and μ is quite similar. In particular, for small values of T the chiral phase transition is always of first order and, for finite quark masses, at certain “end point” the transition turns into a smooth crossover. Predictions for the position of this point are presented.
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