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We update our previous studies of nuclear-matter effects on J/Psi productionin proton-nucleus for the recent LHC pPb runs at sqrt(s_NN)=5 TeV. We haveanalysed the effects of the modification of the gluon PDFs in nucleus, using anexact kinematics for a 2->2 process, namely g+g->J/Psi+g as expected from LOpQCD. This allows to constrain the transverse-momentum while computing thenuclear modification factor for different rapidities, unlike with the usualsimplified kinematics. Owing to the absence of measurement in pp collisions atthe same sqrt(s_NN) and owing to the expected significant uncertainties inyield interpolations which would hinder definite interpretations of nuclearmodification factor --R_pPb--, we have derived forward-to-backward andcentral-to-peripheral yield ratios in which the unknown proton-proton yieldcancel. These have been computed without and with a transverse-momentum cut,e.g. to comply with the ATLAS and CMS constraints in the central-rapidityregion.

Impact of the Nuclear Modification of the Gluon Densities on J/Psi production in pPb collisions at sqrt(s_NN) = 5 TeV