# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

## First results on $V_{ub}$ and $V_{cb}$ with Belle II

29 Jul 2020, 16:00
15m
virtual conference

#### virtual conference

Talk 05. Quark and Lepton Flavour Physics

### Speaker

Racha Cheaib (University of British Columbia)

### Description

Precision measurements of $V_{ub}$ and $V_{cb}$ play a central role in precision tests of the CKM sector of the Standard Model and complement direct measurements of CP violation of B meson decays. In this talk, we present first studies for measuring $V_{ub}$ and $V_{cb}$ with semileptonic decays using collision events recorded at the $\Upsilon(4S)$ resonance by the Belle II experiment. Belle II is located at the SuperKEKB accelerator complex near Tokyo in Japan, and started recording collision data in Spring 2019. We report the status of measuring branching fractions and kinematic properties of inclusive and exclusive $b \to c \ell \bar \nu_\ell$ and $b \to u \ell \bar \nu_\ell$ decays using untagged and tagged approaches and the full available Belle II data set.

### Primary author

Racha Cheaib (University of British Columbia)