Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, De Santo, A, Grandi, M, Jones, S D, Kelsey, D, Koeck, D M, Miano, F, Safarzadeh Samani, B, Salvatore, F, Shaw, K, Spina, M, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Trovato, F, Vivarelli, I, Winkels, E, Winston, O J, Xiotidis, I, ATLAS Collaboration, and others, (2020) Performance of electron and photon triggers in ATLAS during LHC Run 2. European Physical Journal C: Particles and Fields, 80. a47 1-41. ISSN 1434-6044

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Abstract

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.

Item Type:	Article
Additional Information:	56 pages in total, author list starting page 40, 26 figures, 10 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TRIG-2018-05
Keywords:	hep-ex;hep-ex
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor:	Mx Elements Account
Depositing User:	Mx Elements Account
Date Deposited:	29 Apr 2020 12:13
Last Modified:	21 Aug 2020 10:45
URI:	http://sro.sussex.ac.uk/id/eprint/91074

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