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

CMS Collaboration; Canelli, M F; Chiochia, V; Kilminster, B; Robmann, P; et al (2015). Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at $\sqrt{s}=8$. Journal of High Energy Physics:1-33.

## 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 fb$^{−1}$. 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, g$_L$ and g$_R$.

## 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 fb$^{−1}$. 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, g$_L$ and g$_R$.

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