Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy Ion Collisions and QCD Phases 4

HK 34.6: Vortrag

Dienstag, 24. März 2015, 18:30–18:45, T/HS1

Reconstruction of neutral mesons via conversion method in Au+Au at 1.23AGeV with HADES — •Behnke Claudia for the HADES collaboration — Mav.von-Laue Str 1, 60438 Frankfurt

Lepton pairs emerging from decays of virtual photons represent promising probes of matter under extreme conditions. In the energy domain of 1 - 2 GeV per nucleon, the HADES experiment at GSI Helmholtzzentrum fuer Schwerionenforschung in Darmstadt studies di-electron and strangeness production in various reactions, i.e. collisions of pions, protons, deuterons and heavy-ions with nuclei. An accurate determination of the medium radiation depends on a precise knowledge of the underlying hadronic cocktail composed of various sources contributing to the net spectra. Therefore, a measurement of the neutral meson yields together with the dileptons is crucial. In this contribution, the capability of HADES to detect e+ e* pairs from conversions of real photons will be demonstrated. We will present results from a two-photon analysis of Au+Au collisions at 1.23 GeV/u providing information on the production of neutral π⁰ and η mesons. Supported by BMBF (06FY9100I and 05P12RFGHJ), HIC for FAIR, EMMI, GSI, HGS-Hire and H-QM