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Prompt Contributions to the Dilepton Yield in Heavy Ion Collisions

J. Huefner, Yu. P. Ivanov, B. Z. Kopeliovich, J. Raufeisen

nucl-tharXiv:nucl-th/9911064

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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