Luminosity measurements for the <i>R</i> scan experiment at BESIII

Abstract

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