2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192093We review the current status of rho-omega mixing and discuss its implication for our understanding of charge-symmetry breaking. In order to place this work in context we also review the photon-hadron coupling within the framework of vector meson dominance. This leads naturally to a discussion of the electromagnetic form-factor of the pion and of nuclear shadowing.52 pages with 14 figures. This published version includes updated references and minor changes to textHigh Energy Physics - PhenomenologyNuclear Theorytext