2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148042We consider a modification of the standard electroweak model with the third quark generation and the $τ$-lepton in vector representations of $SU(2)\otimes U(1)_Y$ electroweak symmetry. This is a new way to implement right-handed currents which are controlled by the usual Fermi constant, $G_F$, the weak mixing angle, $\sinθ_W$, and also by the right-handed mixing matrices which survive when the Lagrangian density is written in terms of the mass eigenstates. In this case there are also new CP violation phases.14 pages, Revtex, no figure, revised and extended versionHigh Energy Physics - Phenomenologytext