Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T08: Flavour Physics and CP Violation
New results on semileptonic $B$ decays from the Belle experiment
L. Cao
Full text: pdf
Pre-published on: January 24, 2022
Published on: May 12, 2022
Abstract
This proceeding summarizes the recent measurements of semileptonic $b\to u$ decays from the Belle experiment. These analyses use the full data set collected at the $\Upsilon(4S)$ resonance at KEKB accelerator complex with a center-of-mass energy of $\sqrt{s} = 10.58$ GeV, which contains an integrated luminosity of 711 fb$^{-1}$ and corresponds to 772 million $\Upsilon(4S) \to B\bar{B}$ events. In the sector of inclusive decay, the partial branching fraction of $B \to X_{u} \ell \nu$ decays and the CKM matrix element $|V_{ub}|$ are measured with hadronic tagging. The first measurement of differential branching fractions of $B \to X_{u} \ell \nu$ are shown as a function of different kinematic variables in this contribution as a preliminary result. For the exclusive mode, the branching fraction of $B^{+} \to \pi^{+}\pi^{-} \ell \nu$ including both resonant and non-resonant contributions is measured for the first time. The preliminary results on the branching fractions of $B^{+} \to \eta \ell \nu$ and $B^{+} \to \eta^{(\prime)} \ell \nu$ in the full $q^{2}$ range are also presented.
DOI: https://doi.org/10.22323/1.398.0532
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