2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46216Gluons acquire a determinate mass from quark loop radiative corrrections and self-interaction, when these are recomputed with the symmetrical theory of generalised functions. The colour symmetry may be~$U(3)$ instead of~$SU(3)$. The symmetry breaks spontaneously and the ninth colour~$SU(3)$ singlet gluon acquires a very large mass. There may be some experimental support for its existence.Plain TeX, 6 pages, figs. of trivial Feynman diagrams to be addedHigh Energy Physics - Phenomenologytext