Luminosity measurements for the R scan experiment at BESIII

M. Ablikim, M. N. Achasov, S. Ahmed +423

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…