# Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment

Abstract : From April to July 2018, a data sample at the peak energy of the $\Upsilon(4S)$ resonance was collected with the Belle~II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle~II experiment. Using Bhabha scattering events, we measure the integrated luminosity of the data sample to be ($496.7 \pm 0.3 \pm 3.5$)~pb$^{-1}$, where the first uncertainty is statistical and the second is systematic. A measurement with digamma events is performed as a cross-check, and the obtained result is in agreement with the nominal result. This work provides a basis for future luminosity measurements at Belle~II.
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https://hal.archives-ouvertes.fr/hal-02350161
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Submitted on : Tuesday, November 5, 2019 - 11:46:07 PM
Last modification on : Thursday, November 14, 2019 - 6:11:42 AM

### Citation

F. Abudinén, I. Adachi, P. Ahlburg, H. Aihara, N. Akopov, et al.. Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment. 2019. ⟨hal-02350161⟩

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