Renormalization-group approach to transverse-momentum dependent parton distribution functions in QCD

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dc.creatorStefanis, N. G.
dc.creatorCherednikov, I. O.
dc.date2008-09-30
dc.date.accessioned2026-07-07T10:06:26Z
dc.date.available2026-07-07T10:06:26Z
dc.descriptionWe 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.
dc.description9 pages, 5 figures, invited plenary talk given by the first author at XIII International Conference on Selected Problems of Modern Theoretical Physics, Dubna, Russia, June 23-27, 2008
dc.identifierhttps://arxiv.org/abs/0809.5235
dc.identifierhttp://arxiv.org/abs/0809.5235
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170327
dc.subjectHigh Energy Physics - Phenomenology
dc.titleRenormalization-group approach to transverse-momentum dependent parton distribution functions in QCD
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