arXiv:nucl-th/9701064·v1·Nuclear Theory

Low-Mass $e^{+} e^{-}$ Pairs from in-Medium $ρ$ Meson Propagation

R. Rapp🇺🇸 · G. Chanfray🇫🇷 · J. Wambach🇩🇪

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.

Comments: 9 pages LaTeX, postscript figures included using epsf.sty, epsfig.sty; Proc. of the Int. Workshop XXV, Hirschegg '97, on 'QCD Phase Transitions'

Low-Mass e+e− Pairs from in-Medium ρ Meson Propagation

Abstract

Low-Mass $e^{+} e^{-}$ Pairs from in-Medium $ρ$ Meson Propagation