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Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set


CDF Collaboration; et al; Canelli, F; Kilminster, B (2013). Measurement of W-boson polarization in top-quark decay using the full CDF Run II data set. Physical Review D (Particles, Fields, Gravitation and Cosmology), 87(3):31104.

Abstract

We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, tt¯→W+bW−b¯→ℓνbqq¯′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.

Abstract

We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, tt¯→W+bW−b¯→ℓνbqq¯′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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:20 Feb 2014 08:33
Last Modified:05 Apr 2016 17:37
Publisher:American Physical Society
ISSN:1550-2368
Publisher DOI:https://doi.org/10.1103/PhysRevD.87.031104

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