Measurement of the W boson polarization in top quark decays with the ATLAS detector

Barton, Adam and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Davidson, Ruth and de Mora, Lee and Dearnaley, William and Fox, Harald and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Smizanska, Maria and Walder, James (2012) Measurement of the W boson polarization in top quark decays with the ATLAS detector. Journal of High Energy Physics, 2012 (6). ISSN 1029-8479

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Abstract

This paper presents measurements of the polarization of W bosons in top quark decays, derived from tt¯ events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb−1. The measured fractions of longitudinally, left- and right-handed polarization are F 0 = 0.67 ± 0.07, F L = 0.32 ± 0.04 and F R = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

Item Type: Journal Article
Journal or Publication Title: Journal of High Energy Physics
Additional Information: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 68142
Deposited By: ep_importer_pure
Deposited On: 19 Dec 2013 11:02
Refereed?: Yes
Published?: Published
Last Modified: 18 Feb 2020 01:54
URI: https://eprints.lancs.ac.uk/id/eprint/68142

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