Beyond the thermal model in relativistic heavy-ion collisions

Abstract

Deviations from thermal distribution functions of produced particles in relativistic heavy-ion collisions are discussed as indicators for nonequilibrium processes. The focus is on rapidity distributions of produced charged hadrons as functions of collision energy and centrality which are used to infer the fraction of produced particles from a central fireball as compared to the one from the fragmentation sources that are out of equilibrium with the rest of the system. Overall thermal equilibrium would only be reached for large times t -> infinity.

arXiv comment9 pages, 8 figures

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• Diffusion-model analysis of pPb and PbPb collisions at LHC energies
• Cylindrically symmetric diffusion model for relativistic heavy-ion collisions
• Centrality dependence of limiting fragmentation
• Spectral eigenfunction decomposition of a Fokker-Planck operator for relativistic heavy-ion collisions