Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma

We consider the thermal production of dileptons and photons at temperatures above the critical temperature in QCD. In the semi Quark Gluon Plasma (QGP), color excitations are suppressed by a small value of the Polyakov loop. Comparing the semi-QGP to the usual, perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer photons from the semi-QGP than the usual QGP. To illustrate the possible effects we use a hydrodynamic model. Dileptons uniformly exhibit a small elliptical flow, but the strong suppression of photons in the semi-QGP tends to bias the elliptical flow of photons to that generated in the hadronic phase.