2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39749As a part of our study on the SU(n) gauge theory with explicit gauge field mass term this paper is devoted to form the Gupta-Bleuler subspace of the initial-final states in the scattering process.4pages, rewrittenHigh Energy Physics - Phenomenologytext