Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Heavy Ion Collisions and QCD Phases V

HK 21.7: Talk

Tuesday, March 28, 2017, 15:45–16:00, F 3

Preliminary results on the direct photon excess ratio for the HADES experiment — •Christina Deveaux for the HADES collaboration — Justus Liebig Universität, Giessen

Measurements of direct photons from PHENIX and ALICE experiments at high energies show an unexpectedly high yield combined with a large elliptic flow. Both observations cannot be reconciled with current models describing the evolution of the fireball. In order to provide additional empirical data to this discussion, we analyze data on Au+Au collisions at 1.23 AGeV taken by the HADES experiment at GSI Helmholtzzentrum, Darmstadt. We present first results on the direct photon excess ratio as a function of transverse momentum and an estimate of the corresponding systematic uncertainties. Supported by BMBF and HIC for FAIR.