Nuclear matter effects on J/ψ production in asymmetric Cu+Au collisions at √sN N =200 GeV.

Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Alexander, J. and Alfred, M. and Aoki, K. and Apadula, N. and Aramaki, Y. and Asano, H. and Atomssa, E. T. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bai, X. and Bandara, N. S. and Bannier, B. and Barish, K. N. and Bathe, S. and Baublis, V. and Baumann, C. and Baumgart, S. and Bazilevsky, A. and Beaumier, M. and Beckman, S. and Belmont, R. and Berdnikov, A. and Berdnikov, Y. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Varga-Kőfaragó, Mónika and Nagy, Márton and Novák, Tamás and Ster, András and Sziklai, János István and Vargyas, Márton and Vértesi, Róbert (2014) Nuclear matter effects on J/ψ production in asymmetric Cu+Au collisions at √sN N =200 GeV. PHYSICAL REVIEW C, 90 (6). ISSN 2469-9985

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Abstract

We report on J/ψ production from asymmetric Cu+Au heavy-ion collisions at √sN N =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. 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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