J/psi Absorption in Heavy Ion Collisions II

Abstract

Using the methods introduced in a previous paper, we consider the dissociation of J/psi by the lowest-lying pseudoscalar and vector mesons in the hadronic fireball formed in heavy ion collisions, assumed to be a hadron gas at temperature T. Absorption by nuclear matter is accounted for as well. We compare with the S-U and Pb-Pb data presented by the NA50 Collaboration. From data at low centrality we find T=160-180 MeV, close to the predicted temperature of the transition to quark-gluon plasma and to the temperatures measured by hadron abundances. We extrapolate to higher centralities with the approximation of scaling the energy density of the fireball with the average baryon density per unit transverse area. Using the energy-temperature relation of the hadron gas made by the same pseudoscalar and vector mesons, the fall off of J/psi production shown by the NA50 data, can be marginally reproduced only for the highest temperature, T=180 MeV. If we use the energy-temperature relation of a Hagedorn gas with limiting temperature T_H=173 MeV, predictions fall short from reproducing the data. These results suggest that a different mechanism is responsible for the J/psi suppression at large centralities, which could very well be the formation of quark-gluon plasma.

12 pages, 8 figures, revtex, minor corrections in the numerical results

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Cited by in corpus (17)

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• Properties of open and hidden charm mesons in light quark matter
• J/psi dissociation by light mesons in an extended Nambu Jona-Lasinio model
• J/$\psi$ production in In-In and p-A collisions
• Strong Couplings of X(3872)_{J=1,2} and a New Look at J/psi Suppression in Heavy Ion Collisions
• The dissociation of the J/psi by light mesons and chiral symmetry
• Correlating Strangeness Enhancement and J/psi Suppression in Heavy Ion Collisions at sqrt(s)_NN = 17.2 GeV
• Thermodynamic properties of the trigonometric Rosen-Morse potential and applications to a quantum gas of mesons
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• Thermal Time Scales in a Color Glass Condensate
• Impact of unitarization on the $J/\psi$-light meson cross section
• J/psi suppression
• J/Psi strong couplings to the vector mesons
• Quarkonium interactions with (hot) hadronic matter
• Towards a New State of Matter