The ATLAS electron and photon trigger performance in LHC run 2

Research output: Contribution to journalConference articlepeer-review


ATLAS electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential 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. The main triggers used during LHC Run 2 (2015–2018) for those physics studies were a single-electron trigger with ET threshold around 25 GeV and a diphoton trigger with thresholds at 25 and 35 GeV. Relying on those simple, general-purpose triggers is seen as a more robust trigger strategy, at a cost of slightly higher trigger output rates, than to use a large number of analysis-specific triggers. To cope with ever-increasing luminosity and more challenging pile-up conditions at the LHC, the trigger selections needed to be optimized to control the rates and keep efficiencies high. The ATLAS electron and photon trigger performance during Run 2 data-taking is presented as well as work ongoing to prepare for the even higher luminosity of Run 3 (2021–2023).

Original languageEnglish
Pages (from-to)459-463
Number of pages5
JournalCEUR Workshop Proceedings
Publication statusPublished - 1 Jan 2019
Event27th Symposium on Nuclear Electronics and Computing, NEC 2019 - Budva, Montenegro
Duration: 30 Sep 20194 Oct 2019


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