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CMS-TOP-11-020 ; CERN-PH-EP-2013-133
Measurement of the W-boson helicity in top-quark decays from tˉt production in lepton+jets events in pp collisions at √s = 7 TeV
CMS Collaboration
19 August 2013
J. High Energy Phys. 10 (2013) 167
Abstract: The W-boson helicity fractions in top-quark decays are measured with tˉt events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 inverse femtobarns. The measured fractions of longitudinal, left-, and right-handed helicity are F0=0.682±0.030(stat.)±0.033(syst.), FL=0.310±0.022(stat.)±0.022(syst.), and FR=0.008±0.012(stat.)±0.014(syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings gL,gR are also derived.
Links: e-print arXiv:1308.3879 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; HepData record ; CADI line (restricted) ;
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Compact Muon Solenoid
LHC, CERN