On-line luminosity measurements at Belle II

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The Belle II detector at the SuperKEKB e+e- collider started its operation in April 2018. We describe a system used at the Belle II experiment for the on-line measurement of the luminosity provided by the collider utilizing elastic e^+e^- Bhabha scattering and two-photon annihilation processes. A statistical accuracy of 5% has been achieved at the luminosity of 1034 cm-2s-1 with a counting rate of about 1 Hz. The overall systematic uncertainty is estimated to be at the level of 1.7%. Comparison with offline results is also presented.

Original languageEnglish
Article numberC06067
Number of pages6
JournalJournal of Instrumentation
Issue number6
Publication statusPublished - 1 Jun 2020


  • Accelerator subsystems and technologies
  • Hardware and accelerator control systems
  • Performance of high energy physics detectors
  • Trigger algorithms
  • Accelerator Subsystems and Technologies
  • Performance of High Energy Physics Detectors

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