ϒproduction in p(d)A collisions at RHIC and the LHC

We study the effect of nuclear matter in Υ{hooked} production in dAu collisions at RHIC and pPb collisions at the LHC. We find that the nuclear modification factor, R^Υ{hooked}_{d Au}, measured at RHIC is not satisfactorily reproduced by the conventional effects used in the literature, namely the modification of the gluon distribution in bound nucleons and an-effective-survival probability for a bound state to escape the nucleus. In particular, we argue that this probability should be close to 1 as opposed to the J/ψ case. We note that, at backward rapidities, the unexpected suppression of R^Υ{hooked}_{d Au} observed by PHENIX hints at the presence of a gluon EMC effect, analogous to the quark EMC effect-but likely stronger. Further nuclear matter effects, such as saturation and fractional energy loss, are discussed, but none of them fit in a more global picture of quarkonium production. Predictions for Υ{hooked}(nS) for the forthcoming pPb run at 5 TeV at the LHC are also presented.