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We have studied the transverse-momentum ($p_{\rm T}$) dependence of theinclusive J/$\psi$ production in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$TeV, in three center-of-mass rapidity ($y_{\rm cms}$) regions, down to zero$p_{\rm T}$. Results in the forward and backward rapidity ranges ($2.03 <y_{\rm cms} < 3.53$ and $-4.46 <y_{\rm cms}< -2.96$) are obtained by studyingthe J/$\psi$ decay to $\mu^+\mu^-$, while the mid-rapidity region ($-1.37 <y_{\rm cms} < 0.43$) is investigated by measuring the ${\rm e}^+{\rm e}^-$decay channel. The $p_{\rm T}$ dependence of the J/$\psi$ production crosssection and nuclear modification factor are presented for each of the rapidityintervals, as well as the J/$\psi$ mean $p_{\rm T}$ values. Forward andmid-rapidity results show a suppression of the J/$\psi$ yield, with respect topp collisions, which decreases with increasing $p_{\rm T}$. At backwardrapidity no significant J/$\psi$ suppression is observed. Theoretical modelsincluding a combination of cold nuclear matter effects such as shadowing andpartonic energy loss, are in fair agreement with the data, except at forwardrapidity and low transverse momentum. The implications of the p-Pb results forthe evaluation of cold nuclear matter effects on J/$\psi$ production in Pb-Pbcollisions are also discussed.

the journal of high energy physics/the journal of high energy physics

Rapidity and transverse-momentum dependence of the inclusive  J/$\mathbf{\psi}$ nuclear modification factor in p-Pb collisions at  $\mathbf{\sqrt{\textit{s}_{NN}}}=5.02$ TeV