2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230465We prove a theorem in QCD stating that in the limit of strong coupling, $g\to\infty$, the observed spectrum of glueballs in QCD is the same of a pure Yang-Mills theory, being mixing effects due to the next-to-leading order. A full effective theory for QCD is obtained and the width of the $σ$ resonance decay is straightforwardly computed. This appears as the lowest glueball state. Vacuum gluon condensate is computed that consistently support studies on the identification of this meson as a glueball.8 pages, no figure. Added computation of the gluon condensate: SVZ is confirmedHigh Energy Physics - PhenomenologyHigh Energy Physics - LatticeHigh Energy Physics - Theorytext