Speaker
Description
Though the Belle experiment has stopped data taking more than a decade ago, new results on $B$ meson decays are still being obtained. This is in part due to new experimental tools elaborated for Belle II applied to the Belle data set, such as the FEI (Full Event Interpretation) hadronic and semileptonic tag which enables new measurements of $B \to D^{*}\ell\nu$, $B \to D^{\ast\ast}\ell\nu$ and $B \to X\ell\nu$. Other analyses are motivated by the progress in theory such as the measurement of $q^{2}$ moments in $B \to X_{c}\ell\nu$, which allows for a determination of $|V_{cb}|$ up to the order $1/m_{b}^{4}$. The talk covers the study of semileptonic $B$ decay results and related analyses, such as a new high-precision test of QCD factorisation with $\mathcal{B}(\bar{B}^0\to D^{(*)+}\pi^{-})$ and $\mathcal{B}(\bar{B}^0\to D^{(*)+}K^{-})$, with Belle data set.
