Modeling J /Psi production and absorption in a microscopic nonequilibrium approach

  • 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 2 and CHIc 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 in- vestigated. We discuss the e ect of nuclear stopping and the role of leading hadrons. The dependence of the 2/J/psi ratio on the model assumptions and the possible influence of refeeding processes is also studied.

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Author:Christian Spieles, Ramona VogtORCiD, Lars GerlandGND, Steffen A. BassORCiDGND, Marcus BleicherORCiDGND, Horst StöckerORCiDGND, Walter GreinerGND
ArXiv Id:
Document Type:Preprint
Date of Publication (online):2005/12/05
Year of first Publication:1999
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/12/05
Tag:Absorption; Charmonium Produktion; Dynamik; Ultrarelativisitisches; schwere Ion Kollision
Charmonium production; Ultrarelativisitic Quantum Molecular Dynamics model; absorption; heavy ion collisions
Source:Phys.Rev.C60:054901,1999. [hep-ph/9902337]
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht