BELLE2-CONF-PROC-2022-015

Semileptonic and rare decays at Belle II

Daniel Dorner

19 September 2022

Abstract: The Belle II collaboration presents their first measurements of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix elements $|V_{cb}|$ and $|V_{ub}|$, as well as their first branching fraction measurement of $B\rightarrow K^*\ell^+\ell^-$ based on up to 189.26 fb$^{-1}$ of data collected at the $\Upsilon(4S)$ resonance. In all presented analyses the hadronic tag from Belle II's full event interpretation was used. $|V_{cb}|$ was measured using $B^0\rightarrow D^{*-}\ell^+\nu_\ell$ by performing a fit to its w distribution. In addition, the results of an inclusive $|V_{cb}|$ fit based on measurements of $q^2$ moments from Belle II and Belle is presented. $|V_{ub}|$ was obtained using a fit to the $q^2$ distribution of $B^+ \rightarrow \pi^0e^+\nu_{e}$ and $B^0 \rightarrow \pi^-e^+\nu_{e}$.

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