2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51820It is argued that the phenomenon of a flux tube in quantum chromodynamics is closely connected with a spontaneously symmetry breakdown of gauge theory. It is shown that in the presence of a mass term in the SU(2) gauge theory the Nielsen-Olesen equations describe the flux tube surrounded by an external field.unessential changes in the textHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext