Abstract
We present the bulk thermodynamic properties and phase diagram of strongly interacting matter in an extension of the 3-flavor Nambu–Jona-Lasinio (NJL) and Polyakov–Nambu–Jona-Lasinio (PNJL) models of QCD. Using a three-momentum cutoff scheme, we have extended the multiquark interaction terms up to eight order so that the stability of the vacuum is ensured in these models. We explore the effects of various combinations of the two eight-quark couplings and and present a comparative study between the NJL and PNJL models as well as lattice QCD data. The main effect of the eight-quark interaction term is to shift the critical end point in the phase diagram to a lower value of and a higher value of , thus bringing them closer to lattice QCD results.
- Received 17 March 2010
DOI:https://doi.org/10.1103/PhysRevD.82.014021
©2010 American Physical Society