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Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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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.
Date issued
2013-02
URI
http://hdl.handle.net/1721.1/78600
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
1550-7998
1089-4918

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