Belle II

Belle II has been designed to make precise measurements of weak interaction parameters, study exotic hadrons, and search for new phenomena beyond the Standard Model of particle physics. In June 2022, SuperKEKB, the asymmetric energy accelerator that provides e+e collisions inside Belle II, achieved a new luminosity world record of 4.7x1034cm−2s−1. From 2019-2022 Belle II accumulated a 400 fb-1 data sample. These data provide large samples of beauty and charm hadrons, as well as tau leptons. Unique searches for dark-matter related particles are also pursued.

Data taking is resuming in 2024 after a long shutdown period, during which both accelerator and detector have been improved.

Events

Recent

Upcoming

Highlights
Recent publications
  • Search for a \(\mu^+\mu^-\) resonance in four-muon final states at Belle II [2403.02841]
  • Measurement of \(CP\) asymmetries in \(B^0 \to K^0_S K^0_S K^0_S\) decays at Belle II [2403.02590]
  • A new graph-neural-network flavor tagger for Belle II and measurement of \(\sin(2\phi_1)\) in \(B^0\to J/\psi K^0_S \) decays [2402.17260]
  • Measurement of \(CP\) asymmetries in \(B^0\to\eta^\prime K^0_S\) at Belle II [2402.03713]
  • Study of \(\Upsilon(10753)\) decays to \(\pi^+\pi^-\Upsilon(nS)\) final states at Belle II [2401.12021]

Click here for the complete list of publications