Recent J/ψ results in p+p and Au+Au collisions from STAR

Abstract

In these proceedings, we present the measurements of inclusive J/ψ production at mid-rapidity region (|y| < 1.0) in Au+Au collisions at √SNN = 54.4 GeV by the STAR experiment. The dependences of nuclear modification factor (RAA) on centrality and transverse momentum (pT) are presented and compared to model calculations. No significant energy dependence of RAA is found within uncertainties. We also report the distribution of z(J/<) = pTJ/</pTjet and the fraction of J/ψ produced within a charged jet at mid-pseudorapidity (|η| < 0.6) with kinematic cuts of pTjet > 10 GeV/c and pTJ/< > 5 GeV/c in p+p collisions at √S = 500 GeV. Comparisons to model calculations are presented and physics implications are discussed.