2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132537We argue that through the Wilson lines, gauge invariance has as an effect that the hard functions in weighted spin-asymmetries in hadronic scattering processes are given by gluonic pole cross sections, rather than the usual partonic cross sections.Talk presented at the 15th International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2007), April 16-20, 2007, Munich, GermanyHigh Energy Physics - Phenomenologytext