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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Theorie

HK 28.1: Gruppenbericht

Dienstag, 11. März 2008, 11:00–11:30, 2F

Phase transitions in the 2+1 flavor quark-meson model — Bernd-Jochen Schaefer¹, •Mathias Wagner², and Jochen Wambach^2,3 — ¹Institut für Physik, — ²Institut für Kernphysik, TU Darmstadt, D-64289 — ³Gesellschaft für

The phase structure of quantum chromodynamics (QCD) at finite temperature and density is still an open question. At finite chemical potentials QCD lattice calculations suffer from the fermion sign problem. By means of the imaginary chemical potential technique lattice results at finite density become available. These results put the existence of the chiral critical point in the phase diagram into question. In this talk a new analysis of the the 2+1 flavor quark-meson model is presented. The chiral critical surface in the m_π−m_K plane with and without U(1)_A anomaly is discussed. The in-medium scalar and pseudoscalar meson masses are presented in view of the restoration of the chiral and U(1)_A symmetry. The obtained results are compared with other model and lattice calculations.