Measurement of the W-boson helicity in top-quark decays from ttbar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV - Archive ouverte HAL Access content directly
Journal Articles Journal of High Energy Physics Year : 2013

Measurement of the W-boson helicity in top-quark decays from ttbar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV

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S. Chatrchyan
  • Function : Author
M. Titov
  • Function : Author
S. Baffioni
Pierre Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
C. Collard
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini

Abstract

The W-boson helicity fractions in top-quark decays are measured with ttbar 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.

Dates and versions

in2p3-00854502 , version 1 (27-08-2013)

Identifiers

Cite

S. Chatrchyan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the W-boson helicity in top-quark decays from ttbar production in lepton+jets events in pp collisions at sqrt(s)=7 TeV. Journal of High Energy Physics, 2013, 10(2013), pp.167. ⟨10.1007/JHEP10(2013)167⟩. ⟨in2p3-00854502⟩
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