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

J. Hüfner; Y.B. He; B.Z. Kopeliovich

doi:doi:10.1007/s100500050387

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2022 Impact factor 2.7

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. Kopeliovich^2,3

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 $\langle n_{g}\rangle \, \sigma _{\mathrm{abs}}^{\Psi g}$ .