Cold nuclear matter effects on J/ ψ yields in d+Au collisions at PHENIX

Abstract

The latest PHENIX measurements of J / ψ yields in d+Au collisions at s N N = 200 GeV are presented as well as the nuclear modification factor R d A u and R C P . The results span a wide rapidity range ( − 2.2 < y < 2.4 ) and are compared with several theoretical models. The data are also compared to several simple models of the geometric dependence of the nuclear modification. It is found that the forward rapidity data favor a stronger suppression than one that is linear or exponential in the density-weighted longitudinal thickness.