2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41285This talk serves as an introduction to higher twist effects in nuclei. We want to discuss how perturbative QCD can be applied to processes involving heavy nuclei by taking into account multiple scattering.10 pages, 6 figures. Invited talk at the Workshop on "Ultrarelativistic Heavy Ion Collisions", Hirschegg, January 13-19, 2002High Energy Physics - PhenomenologyNuclear Theorytext