EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 7, 239-244

Charmonium suppression by gluon bremsstrahlung in p-A and A-B collisions

J. Hüfner1 - Y.B. He1 - B.Z. Kopeliovich2,3

1 Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, 69120 Heidelberg, Germany
2 Max-Planck Institut für Kernphysik, Postfach 103980, 69029 Heidelberg, Germany
3 Joint Institute for Nuclear Research, Dubna, 141980 Moscow Region, Russia

Received: 20 August 1999 Communicated by W. Weise

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 $\langle n_{g}\rangle$of the prompt gluons are calculated perturbatively and the inelastic cross section $\sigma _{\mathrm{abs}}^{\Psi g} $ is estimated. The integrated cross sections $\sigma (A\, B\longrightarrow J/\psi \, X) $ 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 $\langle n_{g}\rangle \, \sigma _{\mathrm{abs}}^{\Psi g} $.

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

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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