2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197344We explore the unitarity violation of the CKM matrix in the model in which the third generation fermions are subjected to the separate SU(2)$_L$ gauge interaction. With the recent LEP and SLC data at $Z$-pole and low-energy neutral current interaction data, the analysis on the parameter space of the model is updated, and the unitary violation is predicted under the constraint.12 pages, 3 figuresHigh Energy Physics - Phenomenologytext