Can the RHIC J/psi puzzle(s) be settled at LHC?
arXiv:0811.0790 · doi:10.1140/epjc/s10052-009-0906-5
Abstract
One observes strong suppression effects for hard probes, e.g. the production of J/psi or high-pT particles, in nucleus-nucleus (AA) collisions at RHIC. Surprisingly, the magnitude of the suppression is quite similar to that at SPS. In order to establish whether these features arise due to the presence of a thermalized system of quarks and gluons formed in the course of the collision, one should investigate the impact of suppression mechanisms which do not explicitly involve such a state. We calculate shadowing for gluons in the Glauber-Gribov theory and propose a model invoking a rapidity-dependent absorptive mechanism motivated by energy-momentum conservation effects. Furthermore, final state suppression due to interaction with co-moving matter (hadronic or pre-hadronic) has been shown to describe data at SPS. We extend this model by including the backward reaction channel, i.e. recombination of open charm, which is estimated directly from pp data at RHIC. Strong suppression of charmonium both in pA and AA collisions at LHC is predicted. This is in stark contrast with the predictions of models assuming QGP formation and thermalization of heavy quarks.
5 pages, 6 figures, contribution to the proceedings of Hard Probes 2008
References in corpus (9)
- J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV
- Nonperturbative Heavy-Quark Diffusion in the Quark-Gluon Plasma
- Transverse Momentum Spectra of J/ψin Heavy-Ion Collisions
- Charmonium and open charm production in nuclear collisions at SPS/FAIR energies and the possible influence of a hot hadronic medium
- Hard probes in heavy ion collisions at the LHC: heavy flavour physics
- Gluon shadowing in the Glauber-Gribov model at HERA
- J/psi suppression and the nuclear absorption decrease with increasing energy
- Evidence for non-hadronic interactions of charm degrees of freedom in heavy-ion collisions at relativistic energies
- Coherent J/psi production - a novel feature at LHC?