München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 58: Theorie

HK 58.7: Vortrag

Freitag, 24. März 2006, 15:30–15:45, B

Phase diagram of excited hadronic matter — •Detlef Zschiesche, Stefan Schramm und Gebhard Zeeb — Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany

The experimental and theoretical investigation of the QCD phase diagram and the study of the corresponding phase transitions is one of the key issues of the relativistic heavy ion program. Lattice QCD calculations indicate that at mu=0 a rapid crossover occurs, but not a first order phase transition. At T=0 and high densities, different model calculations predict a first order phase transition. Thus there should be a critical point in the T-mu-plane, where the line of first order transitions, starting from the T=0 axis, ends. This picture is supported by recent LQCD calculations at finite chemical potential. To disentangle the physics behind this phase diagram effective models represent a promising tool. Thus we present a chiral hadronic model, which succesfully describes vacuum and nuclear matter properties and in addition qualitatively reproduces the described QCD phase diagram, especially the T and mu values of the endpoint. As an application the corresponding equation of state is used to obtain expansion trajectories for different bombarding energies at the new GSI facility.