The $\Delta B=-\Delta Q$ transitions and $B_d\leftrightarrow {\bar{B}}_d$ oscillations

Abstract

We estimate the product of the relative strength of the $\Delta B=-\Delta Q$ amplitude in the decay $B_d^0\to D^{\ast }\ell {\bar{\nu }}_{\ell }$ 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 ${\rm Y}(4S)$.

8 pages, Latex, no figures