2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180650We reinvestigate Yokoyama's gaugeon formalism for the spontaneously broken Abelian gauge theory. Within the framework of the covariant linear gauges, we give a general gauge-fixing Lagrangian which includes the gauge field, the Goldstone mode, the multiplier B-field and Yokoyama's gaugeon fields (as well as Faddeev-Popov ghosts). As special choices of the values of the gauge-fixing parameters, our theory includes the usual covariant gauges and R$_ξ$-like gauges. Although some of the gauge-fixing parameters can be shifted by the q-number gauge transformation, the $ξ$ parameter cannot be shifted in any of the R$_ξ$-like gauges.PTPTeX<ver0.9>, 19 pages, no figures, to be published in Prog. Theor. Phys. vol.117, No.4, April 2007High Energy Physics - Theorytext