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

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Issue Date
2015-01-12Author
Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
CMS Collaboration
Publisher
Springer Verlag
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Open Access, Copyright CERN, for the benefit of the CMS Collaboration.
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Show full item recordAbstract
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 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.
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Citation
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., … Ghete, V. M. (2015). Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at s√=8 TeV. J. High Energ. Phys., 2015(1). doi:10.1007/jhep01(2015)053
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