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Performance of electron and photon triggers in ATLAS during LHC Run 2

  • Author(s): Aad, G
  • Abbott, B
  • Abbott, DC
  • Abud, AA
  • Abeling, K
  • Abhayasinghe, DK
  • Abidi, SH
  • AbouZeid, OS
  • Abraham, NL
  • Abramowicz, H
  • Abreu, H
  • Abulaiti, Y
  • Acharya, BS
  • Achkar, B
  • Adachi, S
  • Adam, L
  • Bourdarios, CA
  • Adamczyk, L
  • Adamek, L
  • Adelman, J
  • Adersberger, M
  • Adiguzel, A
  • Adorni, S
  • Adye, T
  • Affolder, AA
  • Afik, Y
  • Agapopoulou, C
  • Agaras, MN
  • Aggarwal, A
  • Agheorghiesei, C
  • Aguilar-Saavedra, JA
  • Ahmadov, F
  • Ahmed, WS
  • Ai, X
  • Aielli, G
  • Akatsuka, S
  • Åkesson, TPA
  • Akilli, E
  • Akimov, AV
  • Khoury, KA
  • Alberghi, GL
  • Albert, J
  • Verzini, MJA
  • Alderweireldt, S
  • Aleksa, M
  • Aleksandrov, IN
  • Alexa, C
  • Alexopoulos, T
  • Alfonsi, A
  • Alfonsi, F
  • Alhroob, M
  • Ali, B
  • Aliev, M
  • Alimonti, G
  • Alkire, SP
  • Allaire, C
  • Allbrooke, BMM
  • Allen, BW
  • Allport, PP
  • Aloisio, A
  • Alonso, A
  • Alonso, F
  • Alpigiani, C
  • Alshehri, AA
  • Estevez, MA
  • Piqueras, DÁ
  • Alviggi, MG
  • Coutinho, YA
  • Ambler, A
  • Ambroz, L
  • Amelung, C
  • Amidei, D
  • Santos, SPAD
  • Amoroso, S
  • Amrouche, CS
  • An, F
  • Anastopoulos, C
  • Andari, N
  • Andeen, T
  • Anders, CF
  • Anders, JK
  • Andreazza, A
  • Andrei, V
  • Anelli, CR
  • Angelidakis, S
  • Angerami, A
  • Anisenkov, AV
  • Annovi, A
  • Antel, C
  • Anthony, MT
  • Antipov, E
  • Antonelli, M
  • Antrim, DJA
  • Anulli, F
  • Aoki, M
  • Pozo, JAA
  • Bella, LA
  • Araque, JP
  • Ferraz, VA
  • Pereira, RA
  • et al.
Abstract

© 2019, The Author(s). 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.

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