Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-01-31
Nucl.Phys. A617 (1997) 472-495
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages RevTeX, 9 eps-figures, submitted to Nucl. Phys. A
Scientific paper
10.1016/S0375-9474(97)00137-1
A realistic model for the free rho meson with coupling to two-pion states is employed to calculate the rho propagator in a hot and dense hadron gas. The medium modifications are based on hadronic rescattering processes: intermediate two-pion states are renormalized through interactions with surrounding nucleons and deltas, and rho meson scattering is considered off nucleons, deltas, pions and kaons. Constraints from gauge invariance as well as the full off-shell dynamics of the interactions are accounted for. Within the vector dominance model we apply the resulting in-medium rho spectral function to compute $e^+e^-$ production rates from $\pi^+\pi^-$ annihilation. The calculation of corresponding $e^+e^-$ spectra as recently measured in central collisions of heavy-ions at CERN/SpS energies gives reasonable agreement with the experimental data.
Chanfray Guy
Rapp Ralf
Wambach Jochen
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