Measurement of the $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ branching ratio and $|V_{cb}|$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data

F. Abudinén, I. Adachi, K. Adamczyk +581

We present a measurement of the $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ ($\ell =e,\mu$) branching ratio and of the CKM parameter $|V_{cb}|$ using signal decays accompanied by a f…