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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Physik mit schweren Ionen

HK 27.1: Gruppenbericht

Dienstag, 11. März 2008, 11:00–11:30, 2E

Dilepton production at intermediate energies: What can we learn from HADES about vector meson spectral functions? — •Elvira Santini, Boris Martemyanov, M. D. Cozma, Christian Fuchs, Amand Faessler, and Mikhail Krivoruchenko — Institut für Theoretische Physik, Tübingen Universität, Baden-Württemberg

The vector meson spectral functions are calculated to the first order in the nuclear matter density using the optical potential framework and assuming the dominant contribution comes from the couplings of the vector mesons to nucleons and nucleon resonances. An attempt is made to reproduce the DLS and HADES dilepton production data with the in-medium spectral functions of the vector mesons using the QMD/TU transport model developed earlier for modelling heavy-ion collisions. The results are sensitive to the in-medium broadening of nucleon resonances. A generally good agreement with the HADES data is achieved for selfconsistent treatment of the nucleon resonance broadening and the vector meson spectral functions.