2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42789In order to explain a striking symmetry of the HERA data for virtual photon-proton cross section, I propose a simple model based on the elementary 2-gluon exchange dipole-dipole cross section, and which exhibits geometric scaling. I also suggest that geometric scaling should manifest itself in exclusive processes. A preliminary search for this property in the HERA data is presented.5 pages, talk presented at the 11th International Workshop on Deep-Inelastic Scattering (DIS03), St. Petersburg, April 2003High Energy Physics - Phenomenologytext