J/Psi Absorption Scenarios in Nuclear Collisions
J. Geiss, E. Bratkovskaya, W. Cassing, C. Greiner
Abstract
We study the production of c c pairs and dimuons from hard collisions in nuclear reactions within the covariant transport approach HSD. Adopting 6 mb for the c c-baryon cross section the data on J/Ψ suppression in p + A reactions are reproduced in line with calculations based on the Glauber model. Furthermore, using J/Ψ absorption cross sections with mesons above the DD threshold in the order of 1.5 - 3 mb we find that all data on J/Ψ suppression from NA38/NA50 can be described without assuming the formation of a quark-gluon plasma. Alternatively, we also investigate an 'early'-comover absorption scenario where the c c pairs are dissociated in the color electric fields of neighboring strings. Again we find good agreement with the experimental data with an estimate for the string radius of Rs ≈ 0.2-0.25 fm.
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