2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39354The quantum Dirac-like equation and the QED vertex operator for a composite particle are suggested. The vertex operator and the fermionic propagator are connected by the QED Ward identity. It is shown that all of the Feynman QED-integrals for a three-component particle are finite with some suggestion about large momentum dependence of the vertex operator. This dependence is in agreement with the component counting rules.LaTex, 6 pagesHigh Energy Physics - Phenomenologytext