Electrical conductivity and thermal dilepton rate from quenched lattice QCD

Kaczmarek O, Francis A. Electrical conductivity and thermal dilepton rate from quenched lattice QCD. J.Phys.G. 2011;38(12): 124178.We report on a continuum extrapolation of the vector current correlation function for light valence quarks in the deconfined phase of quenched QCD. This is achieved by performing a systematic analysis of the influence of cut-off effects on light quark meson correlators at $T\simeq 1.45 T_c$ using clover improved Wilson fermions. We discuss resulting constraints on the electrical conductivity and the thermal dilepton rate in a quark gluon plasma. In addition new results at 1.2 and 3.0 $T_c$ will be presented