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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Physik mit schweren Ionen

HK 19.2: Vortrag

Dienstag, 13. März 2007, 17:15–17:30, F

Theoretical analysis of dilepton spectra in low energy heavy ion collisions — •Katharina Schmidt, Harald Kempf, Sascha Vogel, and Marcus Bleicher — Institut für Theoretische Physik, J.W.G-Universität, Frankfurt am Main

Heavy ion collisions are one way to transform nuclear matter into stages of ultrahigh temperatures and densities. Detailed theoretical investigations of the involved resonances, vector mesons and and dileptons are necessary in order to understand the dynamics and properties of the early and late stages of a heavy ion collision. In this talk we present a theoretical investigation of the recent data of the HADES collaboration at SIS-energies with the help of a hadron-string transport approach, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model. It is shown that even without explicit implementation of in-medium effects modifications of dilepton and resonance spectra are possible. Finally we discuss the mass spectrum and possible mass shifts of vector mesons in these reactions.