PHENIX results on J/psi production in Au+Au and Cu+Cu collisions at sqrt(sNN) = 200$~GeV Dr. Hugo Pereira Da Costa Hugo Pereira Da Costa for the PHENIX Collaboration Abstract: Heavy quarkonia production is predicted to be sensitive to the formation of the quark gluon plasma in relativistic heavy ion collisions via competing mechanisms such as color screening and/or quark recombination. The PHENIX collaboration has measured$J/\psi$decay into lepton pairs in Au+Au and Cu+Cu collisions at$\sqrt{s_{NN}}=200$~GeV. The nuclear modification factor$R_{AA}$for the$J/\psi$is obtained by comparing Au+Au or Cu+Cu collisions to p+p collisions. The$R_{AA}$dependence over centrality, transverse momentum and rapidity will be presented both at forward rapidity ($1.2<|\eta|<2.2$) using$J/\psi\rightarrow\mu^+\mu^-$and at mid rapidity ($|\eta|<0.35$) using$J/\psi\rightarrow e^+e^-\$. It will be compared to theoretical predictions and to results obtained from collisions with lighter nuclei.

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