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We measure the polarization of W bosons from top-quark (t) decays into finalstates with a charged lepton and jets, tt --> WbWb --> lvbqqb, using the fullRun II data set collected by the CDF II detector. A model-independent methodsimultaneously 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 modelassumptions. No significant discrepencies with the standard model are observed.

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