Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-08-04
Phys.Lett. B363 (1995) 35-40
Physics
High Energy Physics
High Energy Physics - Phenomenology
1 compressed uuencoded postscript file with 6 figures included, 18 pages
Scientific paper
10.1016/0370-2693(95)01214-B
We present a nonperturbative 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 $\leq $ 1.2 GeV is found to be dominated by the decays of the $\eta, \rho, \omega$ and $\Phi$ 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 $\pi^+\pi^-$ annihilation due to the high pion densities achieved. Whereas for `free' meson masses and form factors the experimental cross section is slightly underestimated for 0.3 GeV $\leq$ m $\leq$ 0.45 GeV, different medium modifications of the $\rho$-meson appear compatible with current CERES data.
Cassing Wolfgang
Ehehalt Wolfgang
Ko Che Ming
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