Heavy Ion Tea

On Heavy Quarkonium Production
Jean-Philippe Lansberg (SLAC)

Abstract: We shall discuss the various mechanisms potentially at work in hadroproduction of heavy quarkonia in the light of computations of higher-order QCD corrections both in the colour-singlet (CS) and colour-octet (CO) channels and the inclusion of the contribution arising from the s-channel cut in the CS channel. Besides, we will discuss new observables meant to better discriminate between these different mechanisms. On the other hand, we will show how the kinematics specific to the J/psi production matters for the extraction of Cold Nuclear Matter effects, e.g. the shadowing of the gluon distribution in nuclei.