2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42014It is shown that in general the gauge given by the limit of $ξ\to 0$ in $R_ξ$ gauge does not necessarily agree with the unitary gauge by examining the symmetry breaking of two steps from ${\rm SU(3) \otimes U(1)}_N$ to ${\rm SU(2) \otimes U(1)}_Y$ and then to ${\rm U(1)}_{em}$.8 page no figuresHigh Energy Physics - Phenomenologytext