2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83038The general gauge-invariant photoproduction formalism given by Haberzettl is applied to kaon photoproduction off the nucleon at the tree level, with form factors describing composite nucleons. Numerical results show that this gauge-invariance procedure, when compared to Ohta's, leads to a much improved description of experimental data. Predictions for the new Bonn SAPHIR data for $p(γ,K^+)Λ$ are given.4 pages; Contribution to the Proceedings of Baryons '98, Bonn, September 22-26, 1998Nuclear Theorytext