Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 3: Heavy Ion Collisions and QCD phases

HK 3.4: Talk

Monday, March 16, 2009, 15:15–15:30, H-ZO 10

Critical point in the QCD phase diagram: role of axial U(1) anomaly and strange quark mass — •Nino Bratovic, Thomas Hell, Simon Rößner, and Wolfram Weise — Physik Department, TU München, 85748 Garching, Germany

We use the Nambu-Jona-Lasinio model extended by Polyakov-loop dynamics (PNJL model) for 2+1 flavours in order to study the QCD phase diagram and associated thermodynamic quantities. In this approach, spontaneous chiral symmetry breaking as well as confinement are realized dynamically in terms of the respective order parameters. In particular, we investigate the existence and location of the critical endpoint in the phase diagram. The dependence on the strength of the U(1)_A symmetry-breaking ’t Hooft interaction and on the strange quark mass m_s is examined. Our findings are compared to related results from other groups.

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