Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/128829
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Type: Journal article
Title: Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
Other Titles: Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at root s = 8 TeV
Author: Aad, G.
Abbott, B.
Abbott, D.C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
Abou Zeid, O.S.
Abraham, N.L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
Achkar, B.
Adam, L.
Adam Bourdarios, C.
Adamczyk, L.
Adamek, L.
Adelman, J.
Adersberger, M.
et al.
Citation: The Journal of High Energy Physics, 2020; 2020(8):051-[i]-051-[66]
Publisher: Springer Nature
Issue Date: 2020
ISSN: 1126-6708
1029-8479
Statement of
Responsibility: 
G. Aad … D. Duvnjak … P. Jackson … A.X.Y Kong … J.L. Oliver … A. Petridis … A. Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration]
Abstract: The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb⁻¹ for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.
Keywords: Hadron-hadron scattering (experiments); top physics
Rights: Copyright CERN, for the benefit of the ATLAS-CMS Collaboration. Article funded by SCOAP³. Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1007/JHEP08(2020)051
Grant ID: ARC
Published version: http://dx.doi.org/10.1007/JHEP08(2020)051
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