The design and performance of the atlas inner detector trigger in high pileup collisions at 13 TeV at the Large Hadron Collider

Callum Kilby

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The design and performance of the ATLAS Inner Detector (ID) trigger algorithms running online on the high level trigger (HLT) processor farm for 13 TeV LHC collision data with high pileup are discussed. The HLT ID tracking is a vital component in all physics signatures in the ATLAS Trigger for the precise selection of the rare or interesting events necessary for physics analysis without overwhelming the offline data storage in terms of both size and rate. To cope with the high expected interaction rates in the 13 TeV LHC collisions the ID trigger was redesigned during the 2013-15 long shutdown. The performance of the ID Trigger in the 2016 data from 13 TeV LHC collisions has been excellent and exceeded expectations as the interaction multiplicity increased throughout the year. The detailed efficiencies and resolutions of the trigger in a wide range of physics signatures are presented, to demonstrate how the trigger responded well under the extreme pileup conditions. The performance of the ID Trigger algorithms in the first data from the even higher interaction multiplicity collisions from 2017 are presented, and illustrates how the ID tracking continues to enable the ATLAS physics program currently, and will continue to do so in the future.
Original languageEnglish
Title of host publication26th International Symposium on Nuclear Electronics and Computing (NEC 2017)
EditorsVladimir Korenkov, Andrey Nechaevskiy
PublisherVladimir Korenkov, Andrey Nechaevskiy
Number of pages10
Publication statusPublished - 18 Dec 2017
Event26th International Symposium on Nuclear Electronics and Computing - Splendid Conference & SPA Resort Hotel, Budva, Montenegro
Duration: 25 Sept 201729 Sept 2017
Conference number: 26

Publication series

NameCEUR Workshop Proceedings
PublisherAachen : R. Piskac c/o Redaktion Sun SITE, Informatik V, RWTH Aachen
ISSN (Electronic)1613-0073


Conference26th International Symposium on Nuclear Electronics and Computing
Abbreviated titleNEC 2017
Internet address


  • tracking
  • track
  • inner detector
  • ID
  • reconstruction
  • trigger
  • triggering
  • pixel
  • silicon
  • SCT
  • run 2
  • computing
  • atlas
  • hep
  • LHC
  • vertex
  • vertexing
  • muon
  • jet

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