Henrik Junkerkalefeld

15 May 2023

Abstract: We present recent measurements of semileptonic $B$-meson decays using a data sample collected at the $\Upsilon(4S)$ resonance by the Belle~II experiment corresponding to an integrated luminosity of $189\,\mathrm{fb}^{-1}$. We determine the CKM-matrix elements $V_\mathrm{cb}$ using untagged $B^0 \to D^{*-} \, \ell^{+} \, \nu_\ell$ decays and $V_\mathrm{ub}$ using untagged $B^0 \to \pi^- \, \ell^+ \, \nu_\ell$ decays. We test light lepton universality in two new analyses using hadronically tagged events. We report the first measurement of a complete set of five different angular distributions using $B^0 \to D^{*-} \, \ell^{+} \, \nu_\ell$ decays and we measure the branching fraction ratio of inclusive $B \to X \, e \, \bar{\nu}_e$ and $B \to X \, \mu \, \bar{\nu}_\mu$ decays.