Performance of the ATLAS muon triggers in Run 2

Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2931 more authors) (2020) Performance of the ATLAS muon triggers in Run 2. JOURNAL OF INSTRUMENTATION, 15 (9). P09015-.

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The performance of the ATLAS muon trigger system is evaluated with proton-proton ($pp$) and heavy-ion (HI) collision data collected in Run 2 during 2015-2018 at the Large Hadron Collider. It is primarily evaluated using events containing a pair of muons from the decay of $Z$ bosons to cover the intermediate momentum range between 25 GeV and 100 GeV. Overall, the efficiency of the single-muon triggers is about 68 % in the barrel region and 85% in the endcap region. The $p_{\text{T}}$ range for efficiency determination is extended by using muons from decays of $J/\psi$ mesons, $W$ bosons, and top quarks. The performance in HI collision data is measured and shows good agreement with the results obtained in $pp$ collisions. The muon trigger shows uniform and stable performance in good agreement with the prediction of a detailed simulation. Dedicated multi-muon triggers with kinematic selections provide the backbone to beauty, quarkonia, and low-mass physics studies. The design, evolution and performance of these triggers are discussed in detail.

Item Type: Article
Additional Information: 60 pages in total, author list starting page 44, 34 figures, 5 tables, submitted to JINST. All figures including auxiliary figures are available at
Uncontrolled Keywords: Data acquisition concepts, Data processing methods, Online farms and online filtering, Trigger concepts and systems (hardware and software)
Depositing User: Symplectic Admin
Date Deposited: 02 Nov 2020 11:27
Last Modified: 18 Jan 2023 23:24
DOI: 10.1088/1748-0221/15/09/P09015
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