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Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $ \sqrt{s}=8 $ TeV

The CMS collaboration
JHEP 1501 (2015) 053, 2015

Abstract (data abstract)
CERN-LHC. 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 femtobarn. The measured helicity fractions are FL=0.298 +/- 0.028(stat) +/- 0.032(syst), F0=0.720 +/- 0.039(stat) +/- 0.037(syst), and FR=-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.

  • Table 1

    Data from Page 11 of JHEP article

    10.17182/hepdata.66567.v1/t1

    Measurement of the W helicity fractions using the cos(theta*l) distribution in the muon channel. The helicity fractions corresponding to the...

  • Table 2

    Data from Page 11 of JHEP article

    10.17182/hepdata.66567.v1/t2

    Measurement of the W helicity fractions using the cos(theta*l) distribution in the electron channel. The helicity fractions corresponding to the...

  • Table 3

    Data from Page 12 of JHEP article

    10.17182/hepdata.66567.v1/t3

    Measurement of the W helicity fractions using the cos(theta*l) distribution in both electron and muon channels. The helicity fractions corresponding...

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