{
  "id": "nucl-th/0203023",
  "version": "v1",
  "published": "2002-03-11T20:07:15.000Z",
  "updated": "2002-03-11T20:07:15.000Z",
  "title": "Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data",
  "authors": [
    "P. Huovinen",
    "M. Belkacem",
    "P. J. Ellis",
    "J. I. Kapusta"
  ],
  "comment": "35 pages, 17 figures",
  "journal": "Phys.Rev. C66 (2002) 014903",
  "doi": "10.1103/PhysRevC.66.014903",
  "categories": [
    "nucl-th",
    "hep-ph",
    "nucl-ex"
  ],
  "abstract": "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-03-11T20:07:15.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.85.Qk",
      "25.75.-q"
    ],
    "keywords": [
      "coarse-grained microscopic dynamics",
      "experimental data",
      "hydrodynamics",
      "high energy nuclear collisions",
      "microscopic event generator urqmd"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. C"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 35,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 583956
    }
  }
}