2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189230Sum rules are derived relating mean squared charge radii of the pseudoscalar mesons with the convergent integral of the difference of hadron photoproduction cross-sections on pseudoscalar mesons.LaTeX, 5 pages, 1 figureHigh Energy Physics - PhenomenologySum rules for total cross-sections of hadron photoproduction on pseudoscalar mesonstext