The Upgrade of the ATLAS Electron and Photon Triggers towards LHC Run 2 and their Performance

Abstract : Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for signal selection in a wide variety of ATLAS physics analyses to study Standard Model processes and to search for new phenomena. Final states including leptons and photons had, for example, an important role in the discovery and measurement of the Higgs particle. Dedicated triggers are also used to collect data for calibration, efficiency and fake rate measurements. The ATLAS trigger system is divided in a hardware-based (Level 1) and a software based high level trigger, both of which were upgraded during the long shutdown of the LHC in preparation for data taking in 2015. The increasing luminosity and more challenging pile-up conditions as well as the planned higher center-of-mass energy demanded the optimisation of the trigger selections at each level to control the rates and keep efficiencies high. The evolution of the ATLAS electron and photon triggers and their performance will be presented, including initial results from the early days of the LHC Run 2 operation.
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Communication dans un congrès
European Physical Society Conference on High Energy Physics 2015 (EPS-HEP), Jul 2015, Vienne, Austria. Proceedings of Science
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http://hal.in2p3.fr/in2p3-01269966
Contributeur : Danielle Cristofol <>
Soumis le : vendredi 5 février 2016 - 14:50:51
Dernière modification le : jeudi 18 janvier 2018 - 02:21:27

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  • HAL Id : in2p3-01269966, version 1

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S. Kahn. The Upgrade of the ATLAS Electron and Photon Triggers towards LHC Run 2 and their Performance. European Physical Society Conference on High Energy Physics 2015 (EPS-HEP), Jul 2015, Vienne, Austria. Proceedings of Science. 〈in2p3-01269966〉

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