Dilepton production at SPS energies
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We present a dynamical study of e+e- production in proton-nucleus and nucleus-nucleus collisions at SPS energies on the basis of a covariant transport approach. For p + A reactions the dilepton yield for invariant masses m 1.2 GeV is found to be dominated by the decays of the , {variant}, and mesons in line with the findings of the CERES Collaboration. For S + Au collisions at 200 GeV/A the dilepton yield is, however, dominated by +- annihilation due to the high pion densities achieved. For 'free' meson masses and form factors the experimental cross section is slightly underestimated for 0.3 GeV m 0.45 GeV. Effects due to different medium modification of the {variant}-meson are studied in comparison to the CERES data. 1995.