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HK: Physik der Hadronen und Kerne
HK 20: Theory III
HK 20.1: Group Report
Tuesday, March 9, 2004, 15:30–16:00, E
Rho-Omega Mixing in Matter — •Felix Riek and Jörn Knoll — Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
The in-medium properties of the light vector mesons in nuclear matter are studied within a self-consistent coupled Dyson scheme. For the nuclear matter part the nucleon, the Δ-isobar and the pion degrees of freedom are explicitly included. Besides the normal couplings short range repulsive correlations of Migdal type are added in order to arrive at a realistic description of the in-medium spectral properties of the pion. All spectral functions are calculated self-consistently as a function of energy and spatial momentum in the density and temperature range till twice ρ0 and T≤ 120 MeV. The properties of the vector mesons are modified through their interaction with the virtual pion cloud by means of the ππρ- and πρω-couplings. With increasing density in particular the space-like parts of the pion spectral function provide a strong mixing between the two vector mesons. This leads to a strong increase the damping with of the ω-meson with increasing density and temperature. Consequences for the in-medium part of di-lepton yields from the electromagnetic decay of both vector mesons are discussed.