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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Schwerionenkollisionen und QCD Phasen II

HK 14.3: Vortrag

Dienstag, 16. März 2010, 15:00–15:15, HG I

Finite lifetime effects on the photon production from a quark-gluon plasma — •Frank Michler¹, Björn Schenke², and Carsten Greiner¹ — ¹Institut für theoretische Physik, Goethe Universität Frankfurt am Main, Max von Laue Straße 1, 60438 Frankfurt am Main, Germany — ²Department of Physics, McGill University, H3A 2T8, Montreal, Quebec, Canada

Direct photons play an important role as electromagnetic probes from a quark-gluon plasma (QGP) created in heavy ion collisions. After being once produced, they leave the medium undisturbed an thus provide direct insight into the early stage of the collision. We use the real time Keldysh formalism to investigate how non-equilibrium effects such as a finite lifetime modify the resulting photon spectra. We provide an ansatz which eliminates the divergent contribution from the vacuum polarization and renders the photon spectrum UV-finite if the time evolution of the QGP is described in a suitable manner.