2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182579The Fock-Tani formalism is a first principle method to obtain effective interactions from microscopic Hamiltonians. Usually this formalism was applied to scattering, here we introduced it to calculate partial decay widths for mesons.Presented at HADRON05 XI. "International Conference on Hadron Spectroscopy" Rio de Janeiro, Brazil, August 21 to 26, 2005High Energy Physics - Phenomenologytext