W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

CDF Collaboration

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7 Citations (Scopus)


We present a measurement of the W-boson polarization in top-quark decays in tt- events with decays to dilepton final states using data corresponding to 5.1 fb-1 of integrated luminosity in pp- collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c2, a simultaneous measurement of the fractions of longitudinal ( f0) and right-handed ( f+) W-bosons yields the results f0 = 0.70-0.17 +0.18 (stat) ± 0.06(syst) and f+ =-0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement 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 the standard model expectation.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-3
Publication statusPublished - May 13 2013
Externally publishedYes


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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