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

Recent Publications
  • Measurement of the inclusive branching fractions for \(B^0_s\) decays into \(D\) mesons via hadronic tagging [2411.14032]
  • Measurement of \(B\to K^*(892)\gamma\) decays at Belle II [2411.10127]
  • Measurement of the time-integrated \(CP\) asymmetry in \(D^0\to K^0_S K^0_S\) decays using Belle and Belle II data [2411.00306]
  • 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]

Click here for the complete list of publications