# Luminosity measurements for the R scan experiment at BESIII

## TL;DR

This paper reports precise luminosity measurements at BESIII across multiple energies using Bhabha scattering and diphoton events, providing essential data for further particle physics analyses.

## Contribution

It presents the first comprehensive luminosity measurements at BESIII over a wide energy range using multiple event channels, improving the accuracy of collider data analysis.

## Key findings

- Luminosity measurements at 131 energy points between 2.2324 and 4.5900 GeV.
- Enhanced precision in luminosity determination for BESIII data sets.
- Data supports accurate R value and J/ψ resonance studies.

## Abstract

By analyzing the large-angle Bhabha scattering events $e^{+}e^{-}$ $\to$ ($\gamma$)$e^{+}e^{-}$ and diphoton events $e^{+}e^{-}$ $\to$ $\gamma\gamma$ for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spectrometer (BESIII) at the Beijing Electron-Positron Collider (BEPCII), the integrated luminosities have been measured at the different c.m. energies, individually. The results are the important inputs for R value and $J/\psi$ resonance parameter measurements.