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Charmonium has served as a valuable probe of the quark gluon plasma in heavy systems, but has also become an interesting probe in small systems, having been studied by ALICE, ATLAS, CMS, LHCb, PHENIX and STAR. With the recent Nature paper PHENIX published regarding v2 and v3 coefficients consistent with hydrodynamic flow and the possibility of droplets of QGP present in small system collisions, measurements on the modification of Charmonium in these same small systems have become increasingly relevant. We present the results of J/psi measurements in the dimuon decay channel for a collection of different systems at the same collision energy. These small systems include: p+p, p+Al, p+Au and 3He+Au at 200 GeV center of mass energy per nucleon-nucleon collision. A comparison of Charmonium modification in 3He+Au and p+Au data was made to look for effects of the increased energy present in the final state for the 3He+Au case. The results are presented in the form of the observable R_AB, the nuclear modification factor, as a function of rapidity, centrality and transverse momentum, then compared with different theoretical model predictions. Also included in this discussion are future plans to extract the nuclear modification factor for the psi(2s), the first excited state of the J/psi meson.
Jin Huang