Performance of CMS muon reconstruction in pp collision events at root s=7Tev

Journal article

The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 pb-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, < 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 GeVc 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. © 2012 IOP Publishing Ltd and Sissa Medialab srl.

Authors: Chatrchyan, S; Khachatryan, V; Sirunyan, A; Tumasyan, A; Adam, W

• Publication status: Published
• Journal: JOURNAL OF INSTRUMENTATION
• Volume: 7
• Issue: 10
• Pages: P10002-P10002
• Publication date: 2012-10-01
• DOI: 10.1088/1748-0221/7/10/P10002
• EISSN: 1748-0221
• ISSN: 1748-0221
• Keywords: Muon spectrometers; Large detector-systems performance; Particle identification methods; Simulation methods and programs; Particle tracking detectors; Particle tracking detectors (Gaseous detectors); Performance of High Energy Physics Detectors