2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194490We derive accurately the fermion resonance propagator by means of Dyson summation of the self-energy contribution. It turns out that the relativistic fermion resonance differs essentially from its boson analog.8 pages, 2 figures, revtex4 class; references added, style correctionsHigh Energy Physics - Phenomenologytext