Performance of CMS muon reconstruction in pp collision events at √s = 7TeV


Chatrchyan S., Khachatryan V., Sirunyan A., Tumasyan A., Adam W., Bergauer T., ...More

Journal of Instrumentation, vol.7, no.10, 2012 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 10
  • Publication Date: 2012
  • Doi Number: 10.1088/1748-0221/7/10/p10002
  • Journal Name: Journal of Instrumentation
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Large detector-systems performance, Muon spectrometers, Particle identification methods, Particle tracking detectors, Particle tracking detectors (Gaseous detectors), Performance of High Energy Physics Detectors, Simulation methods and programs
  • Yıldız Technical University Affiliated: No

Abstract

The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40pb-1 of data collected in pp collisions at √s = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria covering a wide range of physics analysis needs have been examined. For all considered selections, the efficiency to reconstruct and identify a muon with a transverse momentum pT larger than a few GeV/c is above 95% over the whole region of pseudorapidity covered by the CMS muon system, |η| < 2.4, while the probability to misidentify a hadron as a muon is well below 1%. The efficiency to trigger on single muons with pT above a few GeV/c is higher than 90% over the full η range, and typically substantially better. The overall momentum scale is measured to a precision of 0.2% with muons from Z decays. The transverse momentum resolution varies from 1% to 6% depending on pseudorapidity for muons with pT below 100GeV/c and, using cosmic rays, it is shown to be better than 10% in the central region up to pT = 1 TeV/c. Observed distributions of all quantities are well reproduced by the Monte Carlo simulation.