Low-Mass e+e- Pairs from in-Medium ρ Meson Propagation
R. Rapp, G. Chanfray, J. Wambach
Abstract
Based on a realistic model for the rho meson in free space we investigate it's medium modifications in a hot hadron gas generated by hadronic rescattering processes, i.e. renormalization of intermediate two-pion states as well as direct rho meson scattering off hadrons. Within the vector dominance model the resulting in-medium rho spectral function is applied to calculate e+e- spectra as recently measured in heavy-ion collisions at CERN-SpS energies in the CERES experiment.
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