2021 Impact factor 4.991
Particles and Fields
Eur. Phys. J. C16, 519-525
DOI 10.1007/s100520000356

Charmonium production from secondary collisions at LHC energy

P. Braun-Munzinger1 - K. Redlich2

1 Gesellschaft für Schwerionenforschung, GSI Postfach 110552, 64220 Darmstadt, Germany
2 Institute for Theoretical Physics, University of Wroc\law, 50204 Wroc\law, Poland

Received: 3 January 2000 / Published online: 6 July 2000 - © Springer-Verlag 2000

We consider the charmonium production in the thermalized hadronic medium created in ultrarelativistic heavy ion collisions at LHC energy. The calculations for secondary $J/\psi$ and $\psi^{\prime}$ production by $D\bar D$ annihilation are performed within a kinetic model taking into account the space-time evolution of a longitudinally and transversely expanding medium. We show that secondary charmonium production appears almost entirely during the mixed phase, and that it is very sensitive to the charmonium dissociation cross section with co-moving hadrons. Within the most likely scenario for the dissociation cross section of the $J/\psi$ mesons their regeneration in the hadronic medium will be negligible. The secondary production of $\psi^{\prime}$ mesons however, due to their large cross section above the threshold, can substantially exceed the primary yield.

Copyright Società Italiana di Fisica, Springer-Verlag 2000