Measurement of W-Boson Polarization in Top-quark Decay using the Full CDF Run II Data Set

Aaltonen, T.;Vizan Garcia, Jesús Manuel;The CDF Collaboration;et.al.
(2013) Physical Review. D, Particles, Fields, Gravitation and Cosmology — Vol. 87, n° 3, p. 31104 (2013)

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  • Aaltonen, T.
    Author
  • Vizan Garcia, Jesús ManuelUCLouvain
    Author
  • The CDF Collaboration
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  • et. al.
Abstract
We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, tt --> WbWb --> lvbqqb, using the full Run II data set collected by the CDF II detector. A model-independent method simultaneously determines the fraction of longitudinal (f_0) and right-handed (f_+) W bosons to yield f_0 = 0.726 +/- 0.066 (stat) +/- 0.067 (syst) and f_+ = -0.045 +/- 0.044 (stat) +/- 0.058 (syst) with a correlation coefficient of -0.69. Additional results are presented under various standard model assumptions. No significant discrepencies with the standard model are observed.
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Aaltonen, T., Vizan Garcia, J. M., The CDF Collaboration, & et al. (2013). Measurement of W-Boson Polarization in Top-quark Decay using the Full CDF Run II Data Set. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 87(3), 31104. https://doi.org/10.1103/PhysRevD.87.031104 (Original work published 2013)