Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Schwerionenkollisionen und QCD Phasen VII

HK 56.1: Group Report

Thursday, March 24, 2011, 16:30–17:00, HS AP

Polyakov-loop extended Nambu–Jona-Lasinio models meeting Schwinger-Dyson equations — •Thomas Hell, Nino Bratovic, Kouji Kashiwa, and Wolfram Weise — Physik-Department, Technische Universität München, D-85747 Garching, Germany

Given the experimental data from RHIC and upcoming results from ALICE at LHC, it is timely and important to update and improve the modeling of the QCD phase diagram. We use nonlocal extensions of the Polyakov-loop-extended Nambu–Jona-Lasinio (PNJL) [1, 2] models including momentum-dependent wave-function renormalization of the quark propagator. This approach permits to establish close contacts with results from Dyson-Schwinger and lattice-QCD calculations. Both the two and three quark-flavor cases are considered. The coupling to the Polyakov loop allows us to describe the confinement-deconfinement phase transition. Introduction of a nonlocal ’t Hooft-Kobayashi-Maskawa determinant generates an interaction between the up, down and strange quarks describing the anomalous breaking of the axial U(1) symmetry. The thermodynamics of these models leads to (schematic) phase diagrams for strongly interacting matter that are compared to recent lattice data.

[1] T. Hell et al., Phys. Rev. D 79, 014022 (2009).

[2] T. Hell et al., Phys. Rev. D 81, 074034 (2010).

Work supportetd by BMBF, GSI, the DFG Excellence Cluster “Origin and Structure of the Universe”.