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Measurement of the charge ratio of atmospheric muons with the CMS detector
(2010)Physics Letters BWe present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions in the atmosphere, using data collected by the CMS detector both at ground level and in the underground experimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/c to 1 TeV/c. The surface flux ratio is measured to be 1.2766±0.0032(stat.)±0.0032(syst.), independent of the muon momentum, below 100 GeV/c. ...Journal Article -
Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at √s=7 TeV
(2010)Physical Review LettersCharged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s=7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch/dη||η ...Journal Article -
Performance of CMS hadron calorimeter timing and synchronization using test beam, cosmic ray, and LHC beam data
(2010)Journal of InstrumentationJournal Article -
CMS tracking performance results from early LHC operation
(2010)The European Physical Journal CThe first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructed using the all-silicon Tracker and their momenta were measured in the 3.8 T axial magnetic field. Results from the Tracker commissioning are presented including studies of timing, efficiency, signal-to-noise, resolution, and ionization ...Journal Article -
First measurement of the underlying event activity at the LHC with √s = 0.9 TeV
(2010)The European Physical Journal CA measurement of the underlying activity in scattering processes with p T scale in the GeV region is performed in proton–proton collisions at s√=0.9 TeV, using data collected by the CMS experiment at the LHC. Charged particle production is studied with reference to the direction of a leading object, either a charged particle or a set of charged particles forming a jet. Predictions of several QCD-inspired models as implemented in PYTHIA ...Journal Article -
Performance of the CMS drift-tube chamber local trigger with cosmic rays
(2010)Journal of InstrumentationJournal Article -
Alignment of the CMS silicon tracker during commissioning with cosmic rays
(2010)Journal of InstrumentationJournal Article -
Time reconstruction and performance of the CMS electromagnetic calorimeter
(2010)Journal of InstrumentationJournal Article -
Commissioning and Performance of the CMS Silicon Strip Tracker with Cosmic Ray Muons
(2010)Journal of InstrumentationJournal Article -
Alignment of the CMS muon system with cosmic-ray and beam-halo muons
(2010)Journal of InstrumentationJournal Article