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Charmonium suppression by gluon bremsstrahlung in p-A and A-B collisions |
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| Authors: | J Hüfner YB He BZ Kopeliovich |
| Institution: | Institut für Theoretische Physik, Universit?t Heidelberg, Philosophenweg 19, 69120 Heidelberg, Germany, DE Max-Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany, DE |
| Abstract: | Prompt gluons are an additional source for charmonium suppression in nuclear collisions, in particular for nucleus-nucleus collisions. These gluons are radiated as bremsstrahlung in N-N collisions and interact inelastically with the charmonium states while the nuclei still overlap. The spectra and mean number <n g> of the prompt gluons are calculated perturbatively and the inelastic cross section σabs Ψg is estimated. The integrated cross sections σ(A B →J/ψX) for p-A and A-B collisions and the dependence on transverse energy for S-U and Pb-Pb can be described quantitatively with some adjustment of one parameter <n g>σabs Ψg. Received: 20 August 1999 |
| Keywords: | PACS: 25 75 -q Relativistic heavy-ion collisions – 24 85 +p Quarks gluons and QCD in nuclei and nuclear processes – 11 80 La Multiple scattering |
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