Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-03-11
Phys.Rev. C66 (2002) 014903
Physics
Nuclear Physics
Nuclear Theory
35 pages, 17 figures
Scientific paper
10.1103/PhysRevC.66.014903
Radiation of dileptons and photons from high energy nuclear collisions provides information on the space-time evolution of the hot dense matter produced therein. We compute this radiation using relativistic hydrodynamics and a coarse-grained version of the microscopic event generator UrQMD, both of which provide a good description of the hadron spectra. The currently most accurate dilepton and photon emission rates from perturbative QCD and from experimentally-based hadronic calculations are used. Comparisons are made to data on central Pb-Pb and Pb-Au collisions taken at the CERN SPS at a beam energy of 158 A GeV. Both hydrodynamics and UrQMD provide very good descriptions of the photon transverse momentum spectrum measured between 1 and 4 GeV, but slightly underestimate the low mass spectrum of e+e- pairs, even with greatly broadened rho and omega vector mesons. Predictions are given for the transverse momentum distribution of dileptons.
Belkacem M.
Ellis Paul J.
Huovinen Pasi
Kapusta Joseph. I.
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