2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47845The factorisation of the hard amplitude for exclusive meson production in deep inelastic scattering is considered in the framework of a simple model. It is demonstrated explicitly how gauge invariance ensures the cancellation of non-factorising contributions.6 pages LaTeX, 4 figures, Talk presented at the Rencontres de Moriond, "QCD and High Energy Hadronic Interactions", Les Arcs, March 1998High Energy Physics - Phenomenologytext