Measurement of the integrated luminosity of the data collected at 3.773 GeV by BESIII from 2021 to 2024

TL;DR

This paper reports precise measurements of the integrated luminosity at 3.773 GeV using BESIII data, crucial for accurate physics analyses and future experiments.

Contribution

The study provides the first comprehensive integrated luminosity measurements at 3.773 GeV for multiple data sets with detailed systematic uncertainty analysis.

Findings

Integrated luminosities for three data periods are precisely measured.

Systematic uncertainties dominate the total error.

Results enable more accurate future physics analyses.

Abstract

We present a measurement of the integrated luminosity of $e^+e^-$ collision data collected with the BESIII detector at the BEPCII collider at a center-of-mass energy of $E_{\rm cm} = 3.773$~GeV. The integrated luminosities of the data sets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 are determined to be $4.995 \pm 0.019$~fb$^{-1}$, $8.157 \pm 0.031$~fb$^{-1}$, and $4.191 \pm 0.016$~fb$^{-1}$, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements.