Aad, G;
Abbott, B;
Abbott, DC;
Abud, AA;
Abeling, K;
Abhayasinghe, DK;
Abidi, SH;
... et al., .; + view all
(2020)
Performance of electron and photon triggers in ATLAS during LHC Run 2.
European Physical Journal C
, 80
(1)
, Article 47. 10.1140/epjc/s10052-019-7500-2.
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Abstract
Electron and photon triggers covering transverse energies from 5 to several 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 X 20^{34} cm^{-2} s^{-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 , and rises to 96% at 60 ; the trigger efficiency of a 25 leg of the primary diphoton trigger relative to a tight offline photon selection is more than 96% for an offline photon of 30 . 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 above the corresponding trigger threshold.
| Type: | Article |
|---|---|
| Title: | Performance of electron and photon triggers in ATLAS during LHC Run 2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-019-7500-2 |
| Publisher version: | https://doi.org/10.1140/epjc%2Fs10052-019-7500-2 |
| Language: | English |
| Additional information: | © CERN for the benefit of the ATLAS collaboration 2020. s This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10091510 |
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