Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data

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This paper describes the reconstruction of electrons and photons with the ATLAS detector, as employed for measurements and searches exploiting the complete LHC Run 2 dataset.

• An improved energy clustering algorithm is introduced, and its implications for the measurement and identification of electrons and photons are discussed in detail.
• Corrections and calibrations that affect performance, including energy calibration, identification and isolation efficiencies, and the measurement of the charge of reconstructed electron candidates are determined using up to 81 fb$^{-1}$ of proton-proton collision data collected at $\sqrt{s}=$ 13 TeV between 2015 and 2017.