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SUMMARY:Online Luminosity Monitor at Belle II
DTSTART;VALUE=DATE-TIME:20230907T094000Z
DTEND;VALUE=DATE-TIME:20230907T100000Z
DTSTAMP;VALUE=DATE-TIME:20260907T084939Z
UID:indico-contribution-3260@indico.tlabs.ac.za
DESCRIPTION:Speakers: Evgenii Kovalenko (Budker Institute of Nuclear Physi
 cs)\nWe describe a system used for online measurements of luminosity\, uti
 lizing elastic $e^+e^-$ Bhabha scattering and two-photon annihilation proc
 esses reconstructed with the Belle II electromagnetic calorimeter. The Bel
 le II experiment at the SuperKEKB asymmetric-energy $e^+e^-$ collider is d
 esigned to achieve a luminosity of $6\\times10^{35}~\\text{cm}^{-2}\\text{
 s}^{-1}$. With the designed parameters of SuperKEKB\, the statistical accu
 racy of the instantaneous luminosity measurement provided by the Online Lu
 minosity Monitor is expected to be better than $1\\%$ within one second. T
 he overall systematic uncertainty is estimated to be at the level of $1.7\
 \%$. Comparison with a dedicated offline analysis and results on the long-
 term stability of the monitor's performance are also presented.\n\nhttps:/
 /indico.tlabs.ac.za/event/112/contributions/3260/
LOCATION: Meeting Room 2.61 - 2.63
URL:https://indico.tlabs.ac.za/event/112/contributions/3260/
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