München 2006 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 43: Theorie

HK 43.3: Group Report

Thursday, March 23, 2006, 15:00–15:30, G

The Critical Region of the QCD Phase Transition — •Bernd-Jochen Schaefer^1,2 and Jochen Wambach^2,3 — ¹Institut f∖No-dqur Physik, Karl-Franzens-Universit∖No-dqat, A-8010 Graz, Austria — ²Institut f∖No-dqur Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany — ³Gesellschaft f∖No-dqur Schwerionenforschung GSI, D-64291 Darmstadt, Germany

The QCD (tri)critical point is a genuine second-order phase transition and implies the existence of a massless scalar mode. In this talk we focus on the finite region around the critical point and estimate its size. We use the proper-time renormalization group method in order to calculate the scalar and quark-number susceptibilities and compare the results with a mean-field approximation where fluctuations are neglected.