A Unique parametrization of the shapes of secondary dilepton spectra observed in central heavy ion collisions at CERN SPS energies

Oct, 2000
21 pages
Published in:
  • Nucl.Phys.A 688 (2001) 939-955
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Abstract:
A unique parametrization of secondary (thermal) dilepton yields in heavy-ion experiments at CERN-SPS is proposed. This parametrization resembles a thermal qqˉq \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.
  • 25.75.+r
  • 12.38.Mh
  • 24.85.+p
  • Dileptons
  • Deconfined matter
  • Heavy-ion collisions
  • Analysis of CERN-SPS experiments
  • scattering: heavy ion
  • lead
  • sulfur