Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at sqrt(s)=8 TeV

Abstract : A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 inverse femtobarns. The measured helicity fractions are F[L] = 0.298 +/- 0.028 (stat) +\- 0.032 (syst), F[0]=0.720 +/- 0.039 (stat) +/- 0.037 (syst), and F[R] = -0.018 +/- 0.019 (stat) +/- 0.011 (syst). These results are used to set limits on the real part of the tWb anomalous couplings, gL and gR.
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Journal of High Energy Physics, Springer Verlag (Germany), 2015, 01(2015), pp.053. 〈10.1007/JHEP01(2015)053〉
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Contributeur : Dominique Girod <>
Soumis le : mardi 7 octobre 2014 - 11:26:13
Dernière modification le : jeudi 10 mai 2018 - 01:59:54

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V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at sqrt(s)=8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2015, 01(2015), pp.053. 〈10.1007/JHEP01(2015)053〉. 〈in2p3-01071982〉

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