# INSTR'20

24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

## On-line luminosity measurements at Belle II

Not scheduled
20m
Budker Institute of Nuclear Physics

#### Budker Institute of Nuclear Physics

11, akademika Lavrentieva prospect, Novosibirsk, Russia
Board: 96
Poster Colliders and detector integration

### Speaker

Evgeniy Kovalenko (BINP, NSU)

### Description

Belle II detector at SuperKEKB storage ring has started its operation in April 2018. We describe a system used at the Belle-II experiment for the on-line measurements of the luminosity provided by the SuperKEKB collider utilizing elastic e+e- Bhabha scattering and two-photon annihilation processes. Statistical accuracy of 2.3% is achieved at the luminosity of the order of $10^{34}$ with a measurement rate of about 1 Hz. The overall systematic uncertainty is estimated to be at the level of 2%. Comparison with offline results is also presented.

### Presentation Materials

There are no materials yet.