Measurement of the branching fraction $\mathcal{B}({\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell })$ with early Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +533

We measure the branching fractions for the decays ${\bar{B}}^0\to D^{\ast +}{e}^{-}{\bar{\nu }}_e$ and ${\bar{B}}^0\to D^{\ast +}{\mu }^{-}{\bar{\nu }}_{\mu }$ using $8.70\pm 0.09{\mathrm{fb}}^{-1}$ of data collecte…