A unique parametrization of the shapes of secondary dilepton spectra observed in central heavy-ion collisions at CERN-SPS energies
✍ Scribed by K. Gallmeister; B. Kämpfer; O.P. Pavlenko; C. Gale
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 300 KB
- Volume
- 688
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
A unique parametrization of secondary (thermal) dilepton yields in heavy-ion experiments at CERN-SPS is proposed. This parametrization resembles a thermal q 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.