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Performance of the ATLAS Level-1 topological trigger in Run 2

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arxiv 2105.01416 v2 pith:NLGBSGET submitted 2021-05-04 hep-ex

Performance of the ATLAS Level-1 topological trigger in Run 2

classification hep-ex
keywords atlaseventlevel-1topologicaltriggeracceptanceallowedangular
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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During LHC Run 2 (2015-2018) the ATLAS Level-1 topological trigger allowed efficient data-taking by the ATLAS experiment at luminosities up to 2.1x10$^{34}$ cm$^{-2}$s$^{-1}$, which exceeds the design value by a factor of two. The system was installed in 2016 and operated in 2017 and 2018. It uses Field Programmable Gate Array processors to select interesting events by placing kinematic and angular requirements on electromagnetic clusters, jets, $\tau$-leptons, muons and the total energy. It significantly improves the background event rejection and signal event acceptance, in particular for Higgs boson and $B$-physics measurements.

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