Prompt contributions to the dilepton yield in heavy ion collisions |
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| Authors: | J. Hüfner Yu.P. Ivanov B.Z. Kopeliovich J. Raufeisen |
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| Affiliation: | Institut für Theoretische Physik der Universit?t, Philosophenweg 19, 69120 Heidelberg, Germany, DE
Max-Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany, DE
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| 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 |
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| 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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