Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-11-18
Nucl.Phys. A611 (1996) 539-567
Physics
Nuclear Physics
Nuclear Theory
RevTeX, 45 pages, including 21 postscript figures, to be published in Nuclear Physics A
Scientific paper
Dilepton production in proton- and nucleus-induced reactions is studied in relativistic transport model using initial conditions determined by the string dynamics from RQMD. It is found that both the CERES and HELIOS-3 data for dilepton spectra in proton-nucleus reactions can be well described by the `conventional' mechanism of Dalitz decay and direct vector meson decay. However, to provide a quantitative explanation of the observed dilepton spectra in central S+Au and S+W collisions requires contributions other than these direct decays. Introducing a decrease of vector meson masses in hot and dense medium, we find that these heavy-ion data can also be satisfactorily explained. This agrees with our earlier conclusions based on a fire cylinder model. We also give predictions for Pb+Au collisions at 160 GeV/nucleon using current CERES mass resolution and acceptance.
Brown Gerald E.
Ko Che Ming
Li Gu-Qiang
Sorge Heinz
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