Title
Renormalization-group approach to transverse-momentum dependent parton distribution functions in QCD Renormalization-group approach to transverse-momentum dependent parton distribution functions in QCD
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Physics
Source (journal)
arXiv
Volume/pages
(2008) , p. 1-9
Carrier
E-only publicatie
Target language
English (eng)
Abstract
We discuss the renormalization of gauge-invariant transverse-momentum dependent (TMD), i.e., unintegrated, parton distribution functions (PDFs) and carry out the calculation of their anomalous dimension at one loop. We show that in the light-cone gauge, TMD PDFs contain UV divergences that may be attributed to the renormalization effect on a cusp-like junction point of the gauge contours at infinity. In order to eliminate the anomalous dimension ensuing from this cusp, we propose to use in the definition of the TMD PDFs, a soft counter term in terms of a path-ordered phase factor along a particular cusped contour extending to transverse light-cone infinity and comprising light-like and transverse segments. We argue that this additional factor is analogous to the "intrinsic" Coulomb phase factor found before in QED.
E-info
https://repository.uantwerpen.be/docman/iruaauth/75ea7b/88421983768.pdf