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

par Aaltonen, Timo;Barria, Patrizia ; [et al.]
Référence Physical review. D, Particles, fields, gravitation, and cosmology, 87, 03110A
Publication Publié, 2013-02

Article révisé par les pairs

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Résumé :

We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, t¯t→W+bW−¯b→ℓνbq¯q′¯b, using the full Run II data set collected by the CDF II detector, corresponding to an integrated luminosity of 8.7  fb−1. A model-independent method simultaneously determines the fraction of longitudinal (f0) and right-handed (f+) W bosons to yield f0=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 model assumptions. No significant discrepancies with the standard model are observed.