Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set
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Aaltonen-2013-Measurement of W-boson polarization in top-quark decay using the full CDF Run.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Date Issued
February 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Measurement of W-boson Polarization in Top-quark Decay Using the Full CDF Run II Data Set.” Physical Review D 87.3 (2013). ©2013 American Physical Society
Version
Final published version
Abstract
We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, tt̅→W[superscript +]bW[superscript -]b̅→ℓνbqq̅′b̅, using the full Run II data set collected by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb[superscript -1]. A model-independent method simultaneously determines the fraction of longitudinal (f[subscript 0]) and right-handed (f[subscript +]) W bosons to yield f[subscript 0]=0.726±0.066(stat)±0.067(syst) and f[subscript +]=-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 discrepancies with the standard model are observed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.87.031104
