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arXiv · 1204.3788

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

Nino M. Bratovic·Tetsuo Hatsuda·Wolfram Weise
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Abstract

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 $T-μ$ plane close to $μ= 0$ is also examined.

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Nino M. Bratovic, Tetsuo Hatsuda, Wolfram Weise. 2012-04-17. Role of Vector Interaction and Axial Anomaly in the PNJL Modeling of the QCD Phase Diagram. https://doi.org/10.1016/j.physletb.2013.01.003

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