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Nuclear matter effects onJ/ψproduction in asymmetric Cu + Au collisions atsNN=200GeV
We report on $J/\ensuremath{\psi}$ 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 $J/\ensuremath{\psi}$ yields in Cu + Au collisions in the Au-going direction is found to be …