Production and absorption of c c pairs in nuclear collisions at SPS energies
Abstract
We study the production of c c pairs and dimuons from hard collisions in nuclear reactions within the covariant transport approach HSD, which describes successfully both hadronic and electromagnetic observables from p+A and A+A collisions from SIS to SPS energies. The production of c c and Drell-Yan pairs is treated perturbatively employing experimental cross sections while the interactions of cc pairs with hadrons are included by conventional cascade-type two-body collisions. Adopting 6mb for the c c-baryon cross sections the data on J/ suppression in p+A reactions are reproduced in line with calculations based on the Glauber model. We study different models for c c dissociation on mesons in comparison with the experimental data of the HELIOS-3, NA38 and NA50 collaborations. Adopting absorption cross sections with mesons above the DD threshold in the order of 1.5 - 3mb we find that all data on J/ suppression from both proton-nucleus and nucleus-nucleus collisions can be described without assuming the formation of a quark-gluon plasma in these collisions.
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