Abstract
Probes like J/ψ and π0 production are very important for studying the properties of the strongly interacting partonic medium created in heavy ion collisions. Their production is strongly suppressed in =200 GeV Au + Au collisions, in comparison to the expectation from binary collision scaled p + p collisions. The recent low-energy scan at RHIC provided the PHENIX collaboration with an opportunity to study the evolution of the suppression at =39 and 62.4 GeV center of mass energies in order to disentangle multiple contributing mechanisms. The suppression of J/ψ observed is similar to those previously measured at 200 GeV. In contrast neutral pion suppression shows a distinct energy dependence at moderate pT region of the central collisions.
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