Role of Vector Interaction and Axial Anomaly in the PNJL Modeling of the QCD Phase Diagram

Details Role of Vector Interaction and Axial Anomaly in the PNJL Modeling of the QCD Phase Diagram Role of Vector Interaction and Axial Anomaly in the PNJL Modeling of the QCD Phase Diagram

2012-04-17

arxiv.org/abs/1204.3788v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures

Scientific paper

Effects of a flavor singlet vector interaction in the Polyakov - Nambu - Jona-Lasinio (PNJL) model are studied in combination with the axial U(1) breaking Kobayashi - Maskawa - 't Hooft interaction. Using a consistent cutoff scheme we investigate the QCD phase diagram and its dependence on the vector coupling strength $g_v$. We find that the first order chiral phase transition at moderate baryon chemical potentials and its critical point, a generic feature of most NJL-type models without vector coupling, disappear for sufficiently large values of $g_v$ that are consistent with lattice QCD results at imaginary chemical potential. The influence of non-zero $g_v$ on the curvature of the crossover boundary in the $T-\mu$ plane close to $\mu = 0$ is also examined.

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