Abstract :
We discussJ/Ψ suppression in a QCD based nuclear absorption model. Centrality dependence ofJ/Ψ suppression in S+U and in Pb+Pb collisions are explained in the model. However, the model fails to explain the centrality dependence of Ψ′ suppression. Ψ′ suppression in S+U or in Pb+Pb collisions require additional suppression. Additional suppression of Ψ′, due to hadronic comovers or due to QGP formation could not be distinguished in Pb+Pb collisions. We then show that centrality dependence of the ratio, Ψ′ overJ/Ψ, could possibly distinguish two scenario (e.g. QGP or hadronic comover) at RHIC energy.
