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Yields for J/psi production in Cu+Cu collisions at sqrt (s_NN)= 200 GeV havebeen measured by the PHENIX experiment over the rapidity range |y| < 2.2 attransverse momenta from 0 to beyond 5 GeV/c. The invariant yield is obtained asa function of rapidity, transverse momentum and collision centrality, andcompared with results in p+p and Au+Au collisions at the same energy. The Cu+Cudata provide greatly improved precision over existing Au+Au data for J/psiproduction in collisions with small to intermediate numbers of participants,providing a key constraint that is needed for disentangling cold and hotnuclear matter effects.

J/psi Production in sqrt (s_NN)= 200 GeV Cu+Cu Collisions