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

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Version 2 2023-06-07, 08:45
Version 1 2023-06-07, 06:53
journal contribution
posted on 2023-06-07, 08:45 authored by N L Abraham, Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro Cerri, Antonella De SantoAntonella De Santo, Mario Grandi, Samuel Jones, Daniel Christopher Kelsey, Daniela Maria Köck, F Miano, Batool Safarzadeh Samani, Fabrizio SalvatoreFabrizio Salvatore, Kate ShawKate Shaw, Mario Spina, Thomas StevensonThomas Stevenson, K Suruliz, Mark SuttonMark Sutton, Fabio Tresoldi, Fabrizio Trovato, Iacopo Vivarelli, E Winkels, O J Winston, Ioannis Xiotidis, ATLAS Collaboration, others
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

European Physical Journal C: Particles and Fields

ISSN

1434-6044

Publisher

Springer Verlag

Volume

80

Page range

1-41

Article number

a47

Department affiliated with

  • Physics and Astronomy Publications

Notes

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

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2020-04-29

First Open Access (FOA) Date

2020-04-29

First Compliant Deposit (FCD) Date

2020-04-28

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