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Performance of the ATLAS muon triggers in Run 2

Published version
Peer-reviewed

Type

Article

Change log

Authors

Aad, G 
Abbott, B 
Abbott, DC 
Abud, AA 
Abeling, K 

Abstract

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 pT range for efficiency determination is extended by using muons from decays of J/ψ 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.

Description

Keywords

Data acquisition concepts, Data processing methods, Online farms and online filtering, Trigger concepts and systems (hardware and software)

Journal Title

Journal of Instrumentation

Conference Name

Journal ISSN

1748-0221
1748-0221

Volume Title

15

Publisher

IOP Publishing
Sponsorship
Science and Technology Facilities Council (ST/N000234/1)