W boson polarization measurement in the ttbar dilepton channel using the CDF II Detector
CDF Collaboration
Original · EN
We present a measurement of W boson polarization in top-quark decays in tt events with decays to dilepton final states using 5.1 fb⁻¹ of integrated luminosity in pp collisions collected by the CDF II detector at the Tevatron. A simultaneous measurement of the fractions of longitudinal (f₀) and right-handed (f+) W bosons yields the results f₀ = 0.71 ⁺⁰.¹⁸₋₀.₁₇ (stat) ± 0.06 (syst) and f+ = -0.07 ± 0.09 (stat) ± 0.03 (syst). Combining this measurement with our previous result based on single lepton final states, we obtain f₀ = 0.84 ± 0.09 (stat) ± 0.05 (syst) and f₊ = -0.16 ± 0.05 (stat) ± 0.04 (syst). The results are consistent with standard model expectation.
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