2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46602We estimate the product of the relative strength of the $ΔB = -ΔQ$ amplitude in the decay $B_d^0 \rightarrow D^{*} \ell \bar ν_{\ell }$ and the width-difference parameter $y$. For this we have used the data on time-dependence of $B_{d}^0\bar B_{d}^0$ oscillations in Z decays and the fraction of like-sign dilepton events at the $Υ(4S)$.8 pages, Latex, no figuresHigh Energy Physics - Phenomenologytext