Performance of the CMS high-level trigger during LHC Run 2 - INSPIRE

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Performance of the CMS high-level trigger during LHC Run 2

CMS

Collaboration

Oct 22, 2024

62 pages

Published in:

JINST 19 (2024) 11, P11021

Published: Nov 22, 2024

e-Print:

2410.17038 [physics.ins-det]

DOI:

10.1088/1748-0221/19/11/P11021 (publication)

Report number:

CMS-TRG-19-001,
CERN-EP-2024-259

Experiments:

CERN-LHC-CMS

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Abstract: (IOP)

The CERN LHC provided proton and heavy ion collisions duringits Run 2 operation period from 2015 to 2018. Proton-protoncollisions reached a peak instantaneous luminosity of2.1× 10

^{34}

cm

^{-2}

s

^{-1}

, twice the initialdesign value, at √(s)=13 TeV. The CMS experimentrecords a subset of the collisions for further processing as part ofits online selection of data for physics analyses, using a two-leveltrigger system: the Level-1 trigger, implemented in custom-designedelectronics, and the high-level trigger, a streamlined version ofthe offline reconstruction software running on a large computerfarm. This paper presents the performance of the CMS high-leveltrigger system during LHC Run 2 for physics objects, such asleptons, jets, and missing transverse momentum, which meet the broadneeds of the CMS physics program and the challenge of the evolvingLHC and detector conditions. Sophisticated algorithms that wereoriginally used in offline reconstruction were deployedonline. Highlights include a machine-learning b tagging algorithmand a reconstruction algorithm for tau leptons that decayhadronically.

Note:

All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TRG-19-001 (CMS Public Pages) •
This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

Large detector systems for particle and astroparticle physics
Trigger concepts and systems (hardware and software)

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