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HK: Fachverband Hadronen und Kerne
HK 45: Heavy Ion Collisions and QCD phases
HK 45.2: Talk
Wednesday, March 18, 2009, 14:30–14:45, H-ZO 10
How sensitive are di-leptons from rho mesons to the high baryon density region? — •Sascha Vogel1, Hannah Petersen1, Katharina Schmidt1, Elvira Santini1, Christian Sturm2, Jörg Aichelin3, and Marcus Bleicher1 — 1Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 2Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — 3Subatech, Ecole des Mines de Nantes, 4 rue Alfred Kastler, F-44072 Nantes Cedex 03, France
We show that the measurement of di-leptons might provide only a restricted view into the most dense stages of heavy ion reactions. Thus, possible studies of meson and baryon properties at high baryon densities, as e.g. done at GSI-HADES and envisioned for FAIR-CBM and the low energy RHIC program, might observe weaker effects than currently expected in certain approaches. We argue that the strong absorption of resonances in the high baryon density region of the heavy ion collision masks information from the early hot and dense phase due to a strong increase of the total decay width because of collisional broadening. To obtain additional information, we also compare the currently used approaches to extract di-leptons from transport simulations - i.e. shining, only vector mesons from final baryon resonance decays and instant emission of di-leptons and find a strong sensitivity on the method employed in particular at FAIR and SPS energies.