Charmonium production from secondary collisions at LHC energy

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' production by D (D) over bar 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' mesons however, due to their large cross section above the threshold, can substantially exceed the primary yield.