Speaker
Samuel F. Romera
(University of the Basque Country)
Description
When the quarkonium is produced in the low-transverse momentum region, the contribution of soft and ultra-soft radiation between the heavy-quark pair becomes relevant. At this region, non-relativistic QCD breaks down and we need to promote the long-distance matrix elements to the TMD shape functions (TMDShFs). I am going to talk about the cross-section factorization for the $J/\psi$ lepto-production in terms of these TMDShFs. Additionally, I am going to discuss the evolution of the TMDShFs, the matching onto the LDMEs at high $p_T$ and the hard function of the process.
Authors
Samuel F. Romera
(University of the Basque Country)
Miguel Echevarria
(University of the Basque Country UPV/EHU)
Pieter Taels
(Ecole Polytechnique)