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HK: Hadronen und Kerne

HK 54: Structure of Baryons, Mesons VII, Theory

HK 54.5: Talk

Wednesday, March 18, 1998, 16:00–16:15, H

The Spectral Function of the Rho Meson in Nuclear Matter — •Marcus Post, Wolfram Peters, Horst Lenske, Stefan Leupold, and Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen

We calculate the modification of a rho meson in nuclear matter through its coupling to resonance-hole states. Starting from a recently proposed model, we include all four star resonances up to 1.9 GeV. In contrast to previous works, we include not only resonances that couple to the rho in a relative p-wave, but also those that couple to an s-wave state. In addition, we solve the equation for the rho spectral function self-consistently. We find that s-wave resonances affect the in medium spectral function of the rho strongly. As a consequence of the self-consistent treatment we also find a strong enhancement of the widths of the included nucleon resonances in medium.

Supported by BMBF and GSI Darmstadt