TY - JOUR

T1 - Online Luminosity Monitor at Belle II

AU - Коваленко, Евгений Александрович

N1 - Conference code: 6

PY - 2025/7/29

Y1 - 2025/7/29

N2 - We describe a system used for online measurements of luminosity, utilizing elastic e+e− Bhabha scattering and two-photon annihilation processes reconstructed with the Belle II electromagnetic calorimeter. The Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider is designed to achieve a luminosity of 6.3×1035 cm−2s−1.With the designed parameters of SuperKEKB, the statistical accuracy of the instantaneous luminosity measurement provided by the Online Luminosity Monitor is expected to be better than 1% within one second.The overall systematic uncertainty is estimated to be at the level of 1%.Comparison with a dedicated offline analysis and results on the long-term stability of the monitor's performance are also presented.

AB - We describe a system used for online measurements of luminosity, utilizing elastic e+e− Bhabha scattering and two-photon annihilation processes reconstructed with the Belle II electromagnetic calorimeter. The Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider is designed to achieve a luminosity of 6.3×1035 cm−2s−1.With the designed parameters of SuperKEKB, the statistical accuracy of the instantaneous luminosity measurement provided by the Online Luminosity Monitor is expected to be better than 1% within one second.The overall systematic uncertainty is estimated to be at the level of 1%.Comparison with a dedicated offline analysis and results on the long-term stability of the monitor's performance are also presented.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105011415554&origin=inward

U2 - 10.22323/1.468.0018

DO - 10.22323/1.468.0018

M3 - Conference article

VL - 468

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

M1 - 18

T2 - 6th Technology & Instrumentation in Particle Physics

Y2 - 4 September 2023 through 8 September 2023

ER -