Abstract
We derive the formulae for the cross section of J/ψ production in high energy pA and AA collisions taking into account the gluon saturation/color glass condensate effects. We then perform the numerical calculations of the corresponding nuclear modification factors and find 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. Additional final state suppression (at RHIC) and enhancement (at LHC) mechanisms are required to explain the experimental observations.
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