Speaker
Pieter Taels
(University of Antwerp)
Description
Since a long time, quarkonium states have been put forward as excellent probes of the gluon transverse-momentum-dependent (TMD) distributions of the proton. Indeed, being composed of a heavy-quark pair, quarkonia couple to gluons already at lowest order in perturbation theory. It is, however, not so straightforward to establish rigorous factorisation theorems for the relevant cross sections, since soft gluon radiation plays a central role in both the TMD evolution and in the binding mechanism of the onia. In this talk, I give a short overview of the effective-field-theoretical machinery developed to deal with these problems, and apply it to single-inclusive $J/\psi$ leptoproduction and to di-$J/\psi$ hadroproduction.
Author
Pieter Taels
(University of Antwerp)
Co-authors
Miguel Echevarria
(University of the Basque Country UPV/EHU)
Samuel Romera
(EHU)