München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 50: Theorie

HK 50.4: Vortrag

Donnerstag, 23. März 2006, 17:45–18:00, G

The QCD phase diagram: NJL model with diquarks — •Simon Rößner, Claudia Ratti, and Wolfram Weise — Physik Department, Technische Universität München, 85747 Garching, Germany

We present calculations on QCD-based thermodynamics at finite temperature and finite chemical potential, using an extended Nambu and Jona-Lasinio model with inclusion of Polyakov loop dynamics. This model combines features of both chiral symmetry restoration and deconfinement, and incorporates diquark degrees of freedom, promoting insights into regions of large quark chemical potential. Parameters of the Polyakov loop effective potential are fixed to reproduce pure gauge lattice QCD results. Covering wide ranges in the temperature-chemical potential plane this so called PNJL model allows for the computation of the phase diagram. We extract the position of the tri-critical point and discuss its variation with the quark mass.

Work supported in part by BMBF and GSI.