Dileptons and photons from coarse-grained microscopic dynamics and hydrodynamics compared to experimental data

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Abstract

We compute the radiation of dileptons and photons 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 very slightly underestimate the low mass spectrum of e +e- pairs, even with greatly broadened ρ and ω vector mesons.

Original languageEnglish (US)
Pages (from-to)709c-712c
JournalNuclear Physics A
Volume715
DOIs
StatePublished - Mar 10 2003

Bibliographical note

Funding Information:
*This work was done in collaboration was supported by the US Department

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

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