Performance of electron and photon triggers in ATLAS during LHC Run 2 Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for the ATLAS experiment to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena in both proton-proton and heavy-ion collisions. To cope with a fourfold increase of peak LHC luminosity from 2015 to 2018 (Run 2), to 2.1×1034cm−2s−1, and a similar increase in the number of interactions per beam-crossing to about 60, trigger algorithms and selections were optimised to control the rates while retaining a high efficiency for physics analyses. For proton-proton collisions, the single-electron trigger efficiency relative to a single-electron offline selection is at least 75% for an offline electron of 31 GeV, and rises to 96% at 60 GeV; the trigger efficiency of a 25 GeV leg of the primary diphoton trigger relative to a tight offline photon selection is more than 96% for an offline photon of 30 GeV. For heavy-ion collisions, the primary electron and photon trigger efficiencies relative to the corresponding standard offline selections are at least 84% and 95%, respectively, at 5 GeV above the corresponding trigger threshold. 2020-04-14T11:49:57Z 2020-04-14T11:49:57Z 2020-01-22 journal article Aad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., ... & Abreu, H. (2020). Performance of electron and photon triggers in ATLAS during LHC Run 2. The European Physical Journal C, 80(1), 47. http://hdl.handle.net/10481/61186 10.1140/epjc/s10052-019-7500-2 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España Springer Nature