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Nuclear matter effects on J/ψ production in asymmetric Cu+Au collisions at sqrt(s_NN)=200 GeV

We report on J/ψ production from asymmetric Cu+Au heavy-ion collisions at sqrt(s_NN)=200 GeV at the Relativistic Heavy Ion Collider at both forward (Cu-going direction) and backward (Au-going direction) rapidities. The nuclear modification of J/ψ yields in Cu+Au collisions in the Au-going direction is found to be comparable to that in Au+Au collisions when plotted as a function of the number of participating nucleons. In the Cu-going direction, J/ψ production shows a stronger suppression. This difference is comparable in magnitude and has the same sign as the difference expected from shadowing effects due to stronger low-x gluon suppression in the larger Au nucleus.

J/Psi ; heavy-ion collisions ; QUARK-GLUON PLASMA ; Nuclear modification factor ; Cu+Au collisions ; shadowing ; PHENIX ; RHIC ;

PHENIX Collaboration.