Abstract
Abstract We discuss the gluon saturation/color glass condensate effects on J / ψ production in high energy pA and AA collisions. We report the results of numerical calculations of the corresponding nuclear modification factors. We found a good agreement between our calculations and the experimental data on J / ψ production in pA collisions. We also observe that cold nuclear modification effects alone cannot describe the data on J / ψ production in AA collisions. Our numerical calculations indicate that the discrepancy arises mostly from the higher p T ʼs. Additional final state suppression (at RHIC) and enhancement (at LHC) mechanisms are required to explain the experimental data.
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