Speaker
Dr
Jean-Philippe Lansberg
(Institut de Physique Nucléaire d'Orsay (FR))
Description
I will discuss the impact of QCD corrections on the P_T differential cross section for quarkonium production at RHIC [1], Tevatron and LHC energies [2], as well as the contributions from charm-gluon fusion [3]. I will discuss the promising agreement between the parameter-free predictions of the Colour-Singlet Model --up to alpha_s^5 in some cases-- and the first LHC data for J/psi and Upsilon (see e.g. [4-7]), especially in the region of low transverse momenta and thus for the P_T integrated yields. I will also show predictions for the polarisation to be compared with the (forthcoming) LHC results [8]. Additionally, I will justify the introduction of new observables meant to better discriminate between the different mechanisms at work in quarkonium production at high energies. Finally, I will touch upon the issue of the extraction of gluon PDF using quarkonium yields [9] as it was done in pioneer works in the late eighties [10,11].
Author
Dr
Jean-Philippe Lansberg
(Institut de Physique Nucléaire d'Orsay (FR))
