2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46452The diffractive production of vector mesons in ep interactions at low x is a subject of heated debates. This chapter consists of four contributions written by the original authors and expresses the possible scenarios which are to be investigated experimentally.5 pages, LaTeX, To appear in the conference proceedings of the Workshop "Future Physics at HERA"High Energy Physics - PhenomenologyNuclear Theorytext