Cold Nuclear Matter Effects on jpsi Production with Extrinsic pT at   $\sqrt{s_{NN}}=5.5\mathrm{~TeV}$ at the LHC
  Taking into account the gluon shadowing and the $J/\psi$ nuclear absorption, we evaluate the Cold Nuclear Matter (CNM) effects on $J/\psi$ production in $p$Pb and PbPb collisions at the design LHC energy for PbPb collisions, $\sqrt{s_{NN}}=5.5$ TeV. In view of the good agreement between the yield prediction using the LO CSM and the ALICE data at 7 TeV, we employ the latter model to use a complete description of the kinematics of the underlying $2 \rightarrow 2$ partonic process, namely $g + g \rightarrow J/\psi + g$. We observe a large $J/\psi$ suppression in $p$Pb and PbPb collisions due to the strong shadowing of the gluon distribution in the lead ion at the corresponding gluon momentum fractions. This suppression from CNM effects has a strong rapidity dependence which may compensate, partially or completely, that of of the predicted charm recombination in PbPb collisions. 
E. G. Ferreiro, F. Fleuret, J. P. Lansberg, N. Matagne, A.   Rakotozafindrabe
hep-ph