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

Abstract

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.

23 pages including figures (new version: only new output format)

References in corpus (7)

• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• Thermal Dilepton Radiation at Intermediate Masses at the CERN-SpS
• Lattice QCD at Finite Temperature and Density
• Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer
• Aspects of thermal and chemical equilibration of hadronic matter
• Is there a unique thermal source of dileptons in Pb(158 AGeV) + Au, Pb reactions?
• A unique large thermal source of real and virtual photons in the reactions Pb(158 AGeV) + Pb, Au

Cited by in corpus (14)

• Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
• Analysis of dilepton production in Au+Au collisions at sqrt(s_NN)=200 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Suppression of high transverse momentum hadrons at RHIC by (pre-) hadronic final state interactions
• Dilepton production in nucleus-nucleus collisions at top SPS energy within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Leptonic and charged kaon decay modes of the $\varphi$ meson measured in heavy-ion collisions at the CERN SPS
• Production of intermediate-mass dileptons in relativistic heavy ion collisions
• Analysis of Dilepton Invariant Mass Spectrum in C+C at 2 and 1 AGeV
• Electromagnetic Probes
• Thermal Parameters in Heavy Ion Collisions at SPS and RHIC: Centrality Dependence
• Energy loss of quarks in deconfined matter at RHIC: photon-tagged jets, single electron and dilepton spectra from open charm
• Dependence of energy loss of jets on the initial thermodynamic state of deconfined matter at RHIC
• Phi-Meson Production at RHIC, Strong Color Fields and Intrinsic Transverse Momenta
• Relativistic Nucleus-Nucleus Collisions and the QCD Matter Phase Diagram
• Charm and leptons