Abstract
It has become clear in recent studies of d+Au collisions that quantifying the cold nuclear matter effects on J/ψ production is critical to interpreting the results of J/ψ production in heavy ion collisions at RHIC. Recent measurements of the rapidity and impact parameter dependence of J/ψ production in d+Au collisions at =200 GeV by PHENIX show significant suppression at forward rapidity for collisions with small impact parameters, and require a modification which is stronger than linearly or exponentially dependent on the nuclear thickness to describe the forward rapidity data. New measurements of the transverse momentum dependence of the J/ψ nuclear modification in d+Au collisions show a cold nuclear matter effect which increases with increasing pT and suggests a cold nuclear matter contribution in heavy ion collisions which is large at high pT.
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