Performance of the CMS high-level trigger during LHC Run 2
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Date
2024-11
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Journal Article
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Abstract
The CERN LHC provided proton and heavy ion collisions during its Run 2 operation period from 2015 to 2018. Proton-proton collisions reached a peak instantaneous luminosity of 2.1 × 10³⁴ cm⁻²s⁻¹, twice the initial design value, at √(s) = 13 TeV. The CMS experiment records a subset of the collisions for further processing as part of its online selection of data for physics analyses, using a two-level trigger system: the Level-1 trigger, implemented in custom-designed electronics, and the high-level trigger, a streamlined version of the offline reconstruction software running on a large computer farm. This paper presents the performance of the CMS high-level trigger system during LHC Run 2 for physics objects, such as leptons, jets, and missing transverse momentum, which meet the broad needs of the CMS physics program and the challenge of the evolving LHC and detector conditions. Sophisticated algorithms that were originally used in offline reconstruction were deployed online. Highlights include a machine-learning b tagging algorithm and a reconstruction algorithm for tau leptons that decay hadronically.
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published
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Volume
19 (11)
Pages / Article No.
Publisher
IOP Publishing
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Subject
Large detector systems for particle and astroparticle physics; Trigger concepts and systems (hardware and software)
Organisational unit
09720 - de Cosa, Annapaola / de Cosa, Annapaola
03593 - Dissertori, Günther / Dissertori, Günther
03904 - Wallny, Rainer / Wallny, Rainer
Notes
Funding
758316 - Majorana neutrino discovery strategy with CMS (EC)