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Prompt contributions to the dilepton yield in heavy ion collisions |
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| Authors: | J Hüfner YuP Ivanov BZ Kopeliovich J Raufeisen |
| Institution: | Institut für Theoretische Physik der Universit?t, Philosophenweg 19, 69120 Heidelberg, Germany, DE Max-Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany, DE |
| Abstract: | The mass spectrum is calculated for those dileptons which are produced in the early phase of a heavy ion collisions via the direct production NN → l+l−X and via the Compton process GN → l+l−X with prompt gluons radiated in preceding NN interactions. Both mechanisms produce a mass spectrum which decreases steeply with invariant mass of the l+l− pair and which is below the CERES data for Pb-Au collisions by about one order of magnitude. Received: 1 December 1999 / Revised version: 18 February 2000 |
| Keywords: | PACS: 13 85 Qk Inclusive production with identified leptons photons or other nonhadronic particles – 24 85 +p Quarks gluons and QCD in nuclei and nuclear processes – 12 38 Bx Perturbative calculations – 12 38 Lg Other nonperturbative calculations |
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