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Nuclear matter effects on J/psi production in asymmetric Cu+Au collisions at sqrt{s_{_(NN)}} = 200 GeV
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arxiv 1404.1873 v2 pith:ASAQAJSZ submitted 2014-04-07 nucl-ex
Nuclear matter effects on J/psi production in asymmetric Cu+Au collisions at sqrt{s_{_(NN)}} = 200 GeV
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We report on $J/\psi$ 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 $J/\psi$ 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, $J/\psi$ 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. The relative suppression is opposite to that expected from hot nuclear matter dissociation, since a higher energy density is expected in the Au-going direction.
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