Quark Matter 2005 Conference   Quark Matter 2005 Conference

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


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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