2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82836A model for the two-pion photoproduction on the nucleon proposedearlier is modified to simultaneously explain the total cross sections and the invariant mass spectra. Using this model, we discuss the role of the $ρ$ meson in the $γN \to ππN$ reaction.11 pages, 8 ps figures, uses revtex.sty, here.sty, psfig.styNuclear Theorytext