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2020•Journal of InstrumentationOpen access

On-line luminosity measurements at Belle II

E. Kovalenko

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Abstract

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 10 34 cm −2 s −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.

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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 10 34 cm −2 s −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.

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Available abstract

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 10 34 cm −2 s −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.

Key concepts: Luminosity, Collider, Bhabha scattering, Physics, Annihilation, Detector, Nuclear physics, Line (geometry)

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