2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179252We present flavour-symmetric couplings for the OZI-allowed three-meson vertices of effective meson theories, which for the case of the two-meson channels to which the flavour-singlet scalar meson couples, are endowed with a correction factor with respect to the standard formula.11 pages, plain LaTeX, minor changes, more referencesHigh Energy Physics - Phenomenologytext