Semileptonic $B$-meson decays including $b\to c$ anomalies at Belle II

Abstract

We present recent measurements of semileptonic $B$-meson decays using a data sample collected at the ${\rm Y}(4S)$ 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 $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ 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 $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ decays and we measure the branching fraction ratio of inclusive $B\to Xe{\bar{\nu }}_e$ and $B\to X\mu {\bar{\nu }}_{\mu }$ decays.

arXiv commentContribution to the 2023 QCD session of the 57th Rencontres de Moriond