Abstract
Charmonia suppression is one of the highly cited signatures of quark–gluon plasma (QGP) formation in relativistic heavy-ion collisions (Matsui and Satz 1986 Phys. Lett. 178 416). PHENIX observed a large suppression of J/Ψ production in Au+Au collisions at GeV. This suppression is in fact similar to that observed at lower energies at CERN-SPS and there is currently no theoretical consensus explaining both data sets in terms of cold nuclear matter effects, hot nuclear matter suppression and possible regeneration or coalescence mechanisms. In order to separate these effects the PHENIX collaboration also measured J/Ψ production in d+Au collisions at GeV and Au+Au collisions at low energies ( and 39 GeV) to explore the energy dependence of the suppression in an attempt to disentangle the important contributions to the final yield.
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