2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94747Initial- and final-state interactions from gluon-exchange, normally neglected in the parton model have a profound effect in QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, and nuclear shadowing and antishadowing--leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss the use of diffraction to materialize the Fock states of a hadronic projectile and test QCD color transparency.Invited talk presented at the XIth International Conference on Elastic and Diffractive Scattering, Chateau de Blois, France, May 15-20, 2005High Energy Physics - Phenomenologytext