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 (sys) and f_+ = -0.045 +/-
0.044 (stat) +/- 0.058 (sys) with a correlation coefficient of -0.69.
Additional results are also presented under various standard model
assumptions. No significant discrepancies with the standard model are
observed.
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Updated: Friday, 2013 February 22 10:00:03 CST automatically from input from Barbara Hehner