Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Schwerionenkollisionen und QCD Phasen II

HK 14.4: Vortrag

Dienstag, 16. März 2010, 15:15–15:30, HG I

Goldstone Effect and Critical Scaling in QCD with 2+1 flavors — •Wolfgang Unger — Fakultät für Physik, Universität Bielefeld

In the vicinity of the chiral transition temperature, we analyze the quark mass dependence of the chiral condensate and chiral susceptibilitiy in QCD with two degenerate light quarks and a physical strange quark in the chiral limit of the light quark mass. We provide evidence for the influence of thermal fluctuations of Goldstone modes (the pions) on the chiral condensate at finite temperature, and discuss the contribution of these fluctuations to the scaling function, which is found to be in agreement with O(2) scaling. We separately examine the disconnected and connected parts of the light quark susceptibility and discuss the cut-off dependence of chiral condensates and susceptibilities, by comparing lattice data for two different lattice spacings.