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
of the prompt gluons are calculated perturbatively and the inelastic cross section
is estimated. The integrated cross sections
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
.
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