Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-10-30
Nucl.Phys.A688:939-955,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages including figures (new version: only new output format)
Scientific paper
10.1016/S0375-9474(00)00584-4
A unique parametrization of secondary (thermal) dilepton yields in heavy-ion experiments at CERN-SPS is proposed. This parametrization resembles a thermal $q \bar q$ annihilation rate. This is inspired by the observation that lepton pair production rates are quantitatively similar, whether expressed in a hadronic or partonic basis. Adding the thermal yield and the background contributions (hadronic cocktail, Drell-Yan, correlated semileptonic decays of open charm) the spectral shapes of the CERES/NA45, NA38, NA50 and HELIOS/3 data from experiments with lead and sulfur beams can be well described.
Gale Charles
Gallmeister Kai
Kampfer Burkhard
Pavlenko O. P.
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