English

Belle II status and prospects for studies of neutral currents

High Energy Physics - Experiment 2023-08-22 v2

Abstract

The Belle II experiment at the SuperKEKB energy-asymmetric electron-positron collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. Belle II collected a sample of 362 fb1362~\mathrm{fb}^{-1} at the Υ(4S)\Upsilon(4S) resonance between 2019 and 2022, with a maximum peak luminosity of 4.7×1034cm2s14.7 \times 10^{34} \mathrm{cm}^{-2}s^{-1}. Belle II is currently facing a long shutdown period, required for several upgrades of the detector and the collider. Data taking will resume at the end of 2023. We report the recent measurements which involve neutral current transitions in BB meson decays. In particular, we present the current status and future prospects for the branching fractions measurements of the radiative decays BKγB\to K^*\gamma and the fully inclusive BXsγB\to X_s\gamma, the search for B+K+ννˉB^+\to K^+\nu\bar \nu decays, the measurement of the branching fractions of BJ/ψ()KB\to J/\psi(\to \ell\ell)K and BKB\to K^*\ell\ell. Finally, we show the perspectives of the search for BKττB\to K^{*}\tau\tau and the searches of lepton flavor violating channels BK()B\to K^{(*)}\ell\ell', with =e,μ,τ\ell=e, \mu, \tau.

Keywords

Cite

@article{arxiv.2307.04928,
  title  = {Belle II status and prospects for studies of neutral currents},
  author = {Valerio Bertacchi},
  journal= {arXiv preprint arXiv:2307.04928},
  year   = {2023}
}

Comments

Contribution to the New Frontiers in Lepton Flavor 2023 conference