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Journal Article

Performance of the ATLAS muon triggers in Run 2


ATLAS Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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ATLAS Collaboration (2020). Performance of the ATLAS muon triggers in Run 2. Journal of Instrumentation, 15, P09015. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-60.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1B41-1
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.