Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 12: Heavy Ion Collisions and QCD phases

HK 12.7: Vortrag

Montag, 16. März 2009, 18:30–18:45, H-ZO 10

The Chiral Transition in QCD: on the quark mass dependence of Goldstone fluctuations — •Wolfgang Unger — Fakultät für Physik, Universität Bielefeld

Due to fluctuations of the Goldstone pion modes, the chiral susceptibility is expected to diverge in the IR when the chiral limit is approached at temperatures which are large but below the chiral transition temperature. We summarize how this expectation is borne out of chiral perturbation theory in the continuum limit, treating the connected and disconnected contributions separately. Based on rooted staggered chiral perturbation theory we further study possible modifications due to taste violations which arise in the staggered lattice discretization scheme for the quarks. These analytic findings are then confronted with our present numerical results on the chiral susceptibility obtained from simulations with N_f=2+1 flavors at small light quark masses.