Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-13
Phys.Rev. C60 (1999) 054901
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 16 figures
Scientific paper
10.1103/PhysRevC.60.054901
Charmonium production and absorption in heavy ion collisions is studied with the Ultrarelativisitic Quantum Molecular Dynamics model. We compare the scenario of universal and time independent color-octet dissociation cross sections with one of distinct color-singlet J/psi, psi' and chi_c states, evolving from small, color transparent configurations to their asymptotic sizes. The measured J/psi production cross sections in pA and AB collisions at SPS energies are consistent with both - purely hadronic - scenarios. The predicted rapidity dependence of J/psi suppression can be used to discriminate between the two experimentally. The importance of interactions with secondary hadrons and the applicability of thermal reaction kinetics to J/psi absorption are investigated. We discuss the effect of nuclear stopping and the role of leading hadrons. The dependence of the psi' to J/psi ratio on the model assumptions and the possible influence of refeeding processes is also studied.
Bass Steffen A.
Bleicher Marcus
Gerland Lars
Greiner Walter
Spieles C.
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