Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 33: Heavy Ion Collisions and QCD phases

HK 33.6: Talk

Tuesday, March 17, 2009, 18:15–18:30, H-ZO 10

Dilepton production at HADES energies — Katharina Schmidt, •Elvira Santini, and Marcus Bleicher — Institut für Theoretische Physik, Goethe Universität, Frankfurt am Main

Dilepton production in intermediate energies nucleus-nucleus and proton-proton collisions is analysed within the UrQMD transport model. Calculations for dilepton invariant mass spectra are compared with HADES data for C+C reactions at 1 and 2 AGeV and DLS data for proton-proton collisions at 1.04-4.88 GeV. We find that the experimental spectrum for C+C at 2 AGeV is slightly overestimated by the theoretical calculations in the region around the vector meson peak, but fairly described in the low mass region, where the data is satisfactorily saturated by the sources and parametrizations considered. On the contrary, an underestimation of the experimental data is found at 1 AGeV, pointing that at this energy the low mass region is not fully saturated by standardly parametrized Delta Dalitz decays alone. Predictions for dilepton spectra for proton-proton reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV are presented.