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We have carried out a wide study of shadowing and antishadowing effects on\jpsi\ production in \dAu\ collisions at $\sqrt{s_{NN}}=200$ GeV. We havestudied the effects of three different gluon nPDF sets, using the exactkinematics for a $2\to 2$ process, namely $g+g\to J/\psi+g$ as expected from LOpQCD. We have computed the rapidity dependence of \RCP\ and $R_{d\rm Au}$ forthe different centrality classes of the PHENIX data. For mid rapidities, wehave also computed the transverse-momentum dependence of the nuclearmodification factor, which cannot be predicted with the usual $2\to 1$simplified kinematics. All these observables have been compared to the PHENIXdata in \dAu\ collisions.

few-body systems

Centrality, rapidity, and transverse-momentum dependence of gluon  shadowing and antishadowing on $J/\psi$ production in $d$Au collisions at  $\sqrt{s}$=200 GeV