Charged-lepton identification at Belle~II

Abstract

Effective particle identification capabilities are a strategic priority for the physics program of the Belle~II experiment. We describe the algorithms used at Belle~II for identifying electrons and muons and separating them from charged hadrons. We present the performance obtained by the experiment during Run 1, which consists of 428 fb${}^{-1}$ of data collected at the energy-asymmetric $e^{+}{e}^{-}$ collider SuperKEKB between 2019 and 2022 at center-of-mass energies near the mass of the $\hat{I}\yen (4S)$.