(Non)Thermal Aspects of Charmonium Production and a New Look at J/$ψ$ Suppression

Details (Non)Thermal Aspects of Charmonium Production and a New Look at J/$ψ$ Suppression (Non)Thermal Aspects of Charmonium Production and a New Look at J/$ψ$ Suppression

2000-07-26

arxiv.org/abs/nucl-th/0007059v2

Phys.Lett. B490 (2000) 196-202

Physics

Nuclear Physics

Nuclear Theory

12 pages, 3 eps figures, final version with slight corrections, Phys. Lett. B (in print)

Scientific paper

10.1016/S0370-2693(00)00991-6

To investigate a recent proposal that J/$\psi$ production in ultra-relativistic nuclear collisions is of thermal origin we have reanalyzed the data from the NA38/50 collaboration within a thermal model including charm. Comparison of the calculated with measured yields demonstrates the non-thermal origin of hidden charm production at SPS energy. However, the ratio $\psi^{'}$/(J/$\psi)$ exhibits, in central nucleus-nucleus collisions, thermal features which lead us to a new interpretation of open charm and charmonium production at SPS energy. Implications for RHIC and LHC energy measurements will be discussed.

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