PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Operation, Performance and Upgrade of Present Detectors
Early results from Full Event Interpretation at Belle II
W. Sutcliffe* On behalf of the BELLE II collaboration
*corresponding author
Full text: pdf
Pre-published on: February 26, 2021
Published on:
Full Event Interpretation is an algorithm for tag-side $B$ meson reconstruction at Belle II. The algorithm employs a hierarchical reconstruction of exclusive decay chains of $B$ mesons, with multivariate classifiers utilised to identify each unique sub-decay channel. Here, calibration factors are derived for hadronic tag-side $B$ decays by measuring $B \rightarrow X\ell \nu$ decays. For a very loose selection on the tag-side $B$ multivariate classifier, the calibration factors are $0.65 \pm 0.02$ and $0.83 \pm 0.03$ for tag-side $B^{+}$ and $B^{0}$ mesons, respectively. The calibrated hadronic tag-side decay modes are used to measure the branching fractions $\mathcal{B}(B^{0} \rightarrow D^{*+} \ell^{-} \bar{\nu}_{\ell}) = (4.45 \pm 0.41 ({\rm stat}) \pm 0.27 ({\rm sys}) \pm 0.45 (\pi_{\rm s})) \times 10^{-2}$ and $\mathcal{B}(B^{0} \rightarrow \pi^{+} \ell^{-} \bar{\nu}_{\ell}) = (1.62 \pm 0.42 ({\rm stat}) \pm 0.07 ({\rm sys})) \times 10^{-4}$ in $34.6$ fb$^{-1}$ of Belle II data.
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.