Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at 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 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. [Figure not available: see fulltext.]
- Publication:
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Journal of High Energy Physics
- Pub Date:
- January 2015
- DOI:
- 10.1007/JHEP01(2015)053
- arXiv:
- arXiv:1410.1154
- Bibcode:
- 2015JHEP...01..053K
- Keywords:
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- Electroweak interaction;
- Hadron-Hadron Scattering;
- High Energy Physics - Experiment
- E-Print:
- Replaced with published version. Added journal reference and DOI