Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/93262
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Type: Journal article
Title: Measurement of the W boson polarization in top quark decays with the ATLAS detector
Author: ATLAS collaboration
Citation: Journal of High Energy Physics, 2012; 2012(6):88-1-88-45
Publisher: Springer
Issue Date: 2012
ISSN: 1126-6708
1029-8479
Statement of
Responsibility: 
The ATLAS collaboration
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.
Keywords: Hadron-Hadron Scattering
Description: ATLAS Collaborators for the University of Adelaide:
Rights: Open Access, Copyright CERN, for the benefit of the ATLAS collaboration. 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 source are credited.
RMID: 0020132619
DOI: 10.1007/JHEP06(2012)088
Appears in Collections:Physics publications

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