2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190603We demonstrate that a $u-d$ mass difference (which we estimate to be about 4 MeV) within quantum loops, can reproduce the effects of the Coleman-Glashow electromagnetic tadpole operator.14 pages, RevTeX. Replacement includes $a_0$ tadpole contribution. To appear in Phys Rev DHigh Energy Physics - Phenomenologytext