$J/\Psi$ suppression in nuclear collisions at SPS energies

Abstract

We have carried out a first calculation of $J/\Psi$ production from nuclear collisions within the covariant transport approach HSD, which has been very successful in describing both hadronic and electromagnetic observables from heavy-ion collisions at intermediate and high energies. The production of $J/\Psi$'s is based on the Lund string fragmentation model, while its interactions with hadrons are included by conventional cascade-type two-body collisions. Adopting 6 mb for the $J/\Psi$-baryon cross sections and 3 mb for the $J/\Psi$-meson cross sections above the $D\bar{D}$ threshold, we find that data on $J/\Psi$ suppression from both proton-nucleus and nucleus-nucleus collisions (including Pb + Pb) can be explained without assuming the formation of a quark-gluon plasma in these collisions. Our microscopic studies thus confirm the suggestion of Gavin et al. that $J/\Psi$ suppression observed in nuclear collisions is largely due to absorption by comovers, i.e., the produced mesons.

9 pages, LaTeX, plus 4 postscript figures, submitted to Phys. Lett. B

References in corpus (5)

• J/Psi Suppression in Pb-Pb Collisions: A Hint of Quark-Gluon Plasma Production?
• Dilepton Production at SPS Energies
• Analysis of the HELIOS-3 ${\mu }^{+}{\mu }^{-}$ Data within a Relativistic Transport Approach
• Quarkonium Production and Color Deconfinement in Nuclear Collisions
• $J/\psi$ and ${\psi }^{\prime }$ suppression by comovers in Pb+Pb collisions

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