2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204766A range of issues pertaining to the use of Wilson lines in integrated and transverse-momentum dependent (TMD) parton distribution functions (PDF) is discussed. The relation between gauge invariance and the renormalization properties of the Wilson-line integrals is given particular attention. Using an anomalous-dimensions based analysis in the light-cone gauge, a generalized definition of the TMD PDFs is proposed, which employs a cusped Wilson line, and contains an intrinsic "Coulomb-like" phase.5 pages, 2 figures, Invited talk presented by the first author at the XII Advanced Research Workshop on High Energy Spin Physics (DSPIN-07), September 3-7, 2007, Dubna, RussiaHigh Energy Physics - Phenomenologytext