Prompt Contributions to the Dilepton Yield in Heavy Ion Collisions
J. Huefner, Yu. P. Ivanov, B. Z. Kopeliovich, J. Raufeisen
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.
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