The rich physics program of CMS experiment depends on the ability to trigger, reconstruct and identify events with electrons and photons with the CMS detector with excellent efficiency and precision. This article reports an overview of reconstruction and identification of electrons and photons in the CMS detector at the Run-2 of the LHC, and plans for upcoming Run-3. The reconstruction of the energy and momentum of isolated electrons and photons in CMS, combining information from electromagnetic calorimeter and tracking detector, is briefly described. The key variables used to discriminate between electromagnetic objects and jets are discussed as well. The cut-based and multivariate identification criteria of electrons and photons are based on these variables. The performance of triggering, reconstruction and identification of electrons and photons is reported.
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I am grateful to the organizers of the 5th International Conference on Particle Physics and Astrophysics (ICPPA-2020), October 5–9, Moscow, for arranging this very nice and useful virtual meet-up of physicists from across the globe during this difficult times of global pandemic. I am also indebted to my CMS \(e\)/\(\gamma\) colleagues for an extraordinary collaboration. My work is supported by the German Federal Ministry of Education and Research BMBF, and I am thankful for that.
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Mukherjee, S., the CMS collaboration. Electron and Photon Performance in CMS in Run-2 and Prospects for Run-3. Phys. Atom. Nuclei 84, 571–578 (2021). https://doi.org/10.1134/S1063778821040207