# Modelling J/psi production and absorption in a microscopic nonequilibrium approach

Source: [Modelling J/psi production and absorption in a microscopic nonequilibrium approach](<https://www.sota2.com/research/paper/68fa24cf2c2a3760193a9207>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T09:33:00.363Z

Authors: C. Spieles, R. Vogt, L. Gerland, S. A. Bass, M. Bleicher, H. Stoecker, W. Greiner

Published: 1999-02-13T01:42:33.000Z

## Abstract

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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ph/9902337>)

[PDF](<https://arxiv.org/pdf/hep-ph/9902337.pdf>)