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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 74: Schwerionenkollisionen und QCD Phasen

HK 74.5: Talk

Thursday, March 7, 2013, 18:00–18:15, HSZ-201

Off-equilibrium photon production during the chiral phase transition — •Frank Michler1, Hendrik van Hees1,2, Dennis Dean Dietrich1, Stefan Leupold3, and Carsten Greiner11Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt, Germany — 2Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Straße 1, D-60438 Frankfurt, Germany — 3Institutionen för fysik och astronomi, Uppsala Universitet, Box 516, 75120 Uppsala, Sweden

We investigate the photon emission arising from the chiral mass shift during the chiral phase transition in the early stage of ultrarelativistic heavy-ion collisions. As this mass shift leads the spontaneous creation of quark-antiquark pairs and thus contributes to the formation of the quark-gluon plasma, our investigations are relevant in the context of finite lifetime effects on the photon emission from the latter. Earlier investigations on this topic were accompanied by a divergent vacuum contribution and a non-integrability of the remaining contributions in the ultraviolet domain. In contrast to these investigations, we do not consider the photon numbers at finite times but for free asymptotic states obtained by an adiabatic switching of the electromagnetic interaction according to the Gell-Mann and Low theorem. This approach eliminates possible unphysical vacuum contributions and leads to photon spectra integrable in the UV domain. It is emphasized that the consideration of free asymptotic states is indeed crucial to obtain such physically reasonable results.
Supported by Land Hessen and HGS-HIRe.

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