$J/\psi$ production in Au+Au/Cu+Cu collisions at ${\sqrt{s}}_{NN}$=200 GeV and the threshold model

Abstract

Using the QGP motivated threshold model, where all the $J/\psi$'s are suppressed above a threshold density, we have analyzed the preliminary PHENIX data on the centrality dependence of nuclear modification factor for $J/\psi$'s in Cu+Cu and in Au+Au collisions, at RHIC energy, ${\sqrt{s}}_{NN}$=200 GeV. Centrality dependence of $J/\psi$ suppression in Au+Au collisions are well explained in the model for threshold densities in ranges of 3.6-3.7 $f{m}^{-2}$. $J/\psi$ suppression in Cu+Cu collisions on the other hand are not explained in the model.

6 pages, 5 figures

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