$J/\psi$ suppression at $\sqrt{{\bf s}} = 200$ GeVin the comovers’ interaction model

Abstract

The yield of $J/\psi$ per binary nucleon-nucleon collision in AuAu and CuCu collisions at $\sqrt{s} = 200$ GeV is computed in the framework of the dual parton model, supplemented with final state interaction (comovers’ interaction). For the latter we use the same value of the cross-section, $\sigma_{\mathrm{{co}}} = 0.65$ mb, which describes the anomalous $J/\psi$ suppression observed at CERN-SPS energies. Several possibilities for the value of the absorptive cross-section are considered. Shadowing is introduced in both the comovers’ and the $J/\psi$ yields. A comparison with the results at CERN-SPS, including a prediction for InIn collisions, is also presented.