Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Schwerionenkollisionen und QCD Phasen VII

HK 56.4: Talk

Thursday, March 24, 2011, 17:30–17:45, HS AP

Critical point in the QCD phase diagram and Columbia plot: role of axial U(1) anomaly at finite chemical potential — •Nino Bratovic and Wolfram Weise — Physik Department, TU München, 85748 Garching, Germany

The Nambu-Jona-Lasinio model extended by Polyakov-loop dynamics (PNJL model) for 2 + 1 flavors is used in order to study the QCD phase diagram and associated thermodynamic quantities. In this approach, spontaneous chiral symmetry breaking as well as color singlet suppression in the hadronic phase are realized dynamically in terms of the respective order parameters.

In particular, we investigate the so-called Columbia plot for different values of the quark chemical potential. The Columbia plot is a concise way of presenting the order of the chiral transition as a function of the current quark masses (m_u, m_s). Our findings are compared to related results from other groups. In addition, the influence of the strength of the U(1)_A symmetry breaking Kobayashi-Maskawa-’t Hooft interaction is examined.

Work supported in part by BMBF, GSI and the DFG Excellence Cluster "Origin and Structure of the Universe".