Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Hadronenstruktur und -spektroskopie III

HK 11.2: Talk

Monday, March 21, 2011, 17:00–17:15, C-2

Thermal dilepton rate and electrical conductivity from quenched lattice QCD — •Anthony Francis — Universitaet Bielefeld

We calculate the vector current correlation function for light valence quarks in the deconfined phase of QCD. The calculations were performed in quenched lattice QCD at T=1.45Tc for four values of the lattice cut-off on lattices up to size Ns=128 x Nt=48. This enables a continuum extrapolation of the correlation function in a large Euclidean time interval to better than 1% accuracy. In addition the first two non-vanishing thermal moments are determined. Overall we can conclude that the vector correlation function at this temperature never deviates by more than 9% from the free massless correlator, while the moment stays within 7% of the corresponding free value. We discuss consequences of our findings for the electrical conductivity and dilepton rate in a quark gluon plasma.