Performance of the CMS Level-1 trigger during commissioning with cosmic ray muons and LHC beams


Chatrchyan S., Khachatryan V., Sirunyan A. M. , Adam W., Arnold B., Bergauer H., ...More

JOURNAL OF INSTRUMENTATION, vol.5, 2010 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 5
  • Publication Date: 2010
  • Doi Number: 10.1088/1748-0221/5/03/t03002
  • Journal Name: JOURNAL OF INSTRUMENTATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Trigger concepts and systems (hardware and software), Trigger algorithms
  • Middle East Technical University Affiliated: No

Abstract

The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.