Semileptonic and rare decays at Belle II

Sumitted to PubDB: 2022-09-30

Category: Proceeding, Visibility: Public

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Authors
Non-Belle II authors Daniel Dorner
Date Sept. 19, 2022
Belle II Number BELLE2-CONF-PROC-2022-015
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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