# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Measurement of the mixing parameter $\chi_d$ in semi-leptonic B meson decays at Belle II

26 Jul 2021, 10:15
15m
Zoom

#### Zoom

Parallel session talk Flavour Physics and CP Violation

### Speaker

Stephan Duell (BELLE (BELLE II Experiment))

### Description

Inclusive semi-leptonic decays of $B$ mesons are an excellent avenue for the study of B\bar{B} mixing, given their large branching fraction. In this talk, we present the measurement of the time integrated mixing parameter, $\chi_d$, using data collected by the Belle II detector. The Belle II experiment is located at the SuperKEKB laboratory in Tsukuba, Japan where electron-positron collisions at the $\Upsilon(4S)$ energy yield a large number of B\bar{B} events. The mixing parameter $\chi_d$ is determined by examining the charge of reconstructed lepton pairs in $B \rightarrow X \ell \nu$ events. The result is based on 74 $fb^{-1}$ of Belle II reprocessed data.

Email libby@iitm.ac.in Belle II Jim Libby