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 has resumed in 2024 after a long shutdown period, during which both accelerator and detector have been improved.

Events

Here is the complete list of events

Highlights
Recent publications
  • Model-independent measurement of \(D^0\)-\(\bar{D}^0 \) mixing parameters in \(D^0\to K^0_S\pi^+\pi^-\) decays at Belle and Belle II [2410.22961]
  • Observation of time-dependent \(CP\) violation and measurement of the branching fraction of \(B^0\to J/\psi \pi^0\) decays [2410.08622]
  • Search for \(CP\) violation in \(D^+_{(s)}\to K^0_S K^-\pi^+\pi^+\) decays using triple and quadruple products [2409.15777]
  • Determination of \(|V_{\rm ub}|\) from simultaneous measurements of untagged \(B^0\to \pi^-\ell^+\nu_\ell\) and \(B^+\to \rho^0\ell^+\nu_\ell\) decays [2407.17403]
  • Measurement of \(CP\) asymmetries in \(B^0\to K^0_S\pi^0\gamma\) decays at Belle II [2407.09139]

Click here for the complete list of publications