Measurements of charmonium and bottomonium production in pPb collisions with a nucleon-nucleon centre-of-mass energy of 5 TeV by the ALICE and LHCb collaborations are presented.
The aim is to extract information about cold nuclear matter effects affecting signatures for the formation of a quark gluon plasma in heavy ion collisions, which requires as input the production cross-section for quarkonia in pp collisions at 5 TeV, where no data exist.
Experimental results obtained for the various resonance states will be presented and issues related to the cross-section interpolation will be discussed.
Finally, the comparison with theoretical predictions based on cold nuclear matter effects as shadowing, as well as on models including a contribution from partonic energy loss will also be addressed, together with the implications these pPb results may have for the interpretation of quarkonium behaviour in PbPb collisions.
