@Article{ATLASandCMSCollaborationsAad_etal2020,
author="ATLAS and CMS Collaborations (Aad, G. et al
and Aparisi Pozo, J. A.
and Bailey, A. J.
and Cabrera Urban, S.
and Castillo, F. L.
and Castillo Gimenez, V.
and Cerda Alberich, L.
and Costa, M. J.
and Escobar, C.
and Estrada Pastor, O.
and Ferrer, A.
and Fiorini, L.
and Fullana Torregrosa, E.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gonzalez de la Hoz, S.
and Gonzalvo Rodriguez, G. R.
and Guerrero Rojas, J. G. R.
and Higon-Rodriguez, E.
and Lacasta, C.
and Lozano Bahilo, J. J.
and Madaffari, D.
and Mamuzic, J.
and Marti-Garcia, S.
and Martinez Agullo, P.
and Mi{\~{n}}ano, M.
and Mitsou, V. A.
and Moreno Llacer, M.
and Poveda, J.
and Rodriguez Bosca, S.
and Rodriguez Rodriguez, D.
and Ruiz-Martinez, A.
and Salt, J.
and Santra, A.
and Soldevila, U.
and Sanchez, J.
and Valero, A.
and Valls Ferrer, J. A.
and Vos, M.",
title="Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at root s=8 TeV",
journal="Journal of High Energy Physics",
year="2020",
publisher="Springer",
volume="08",
number="8",
pages="051--67pp",
optkeywords="Hadron-Hadron scattering (experiments); Top physics",
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 (F-0), left-handed (F-L), or right-handed (F-R) polarizations. The resulting combined measurements of the polarization fractions are F-0= 0.693 +/- 0.014 and F-L= 0.315 +/- 0.011. The fractionF(R)is calculated from the unitarity constraint to be F-R=-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 F-0(F-L) with respect to the most precise single measurement. A limit on anomalous right-handed vector (V-R), and left- and right-handed tensor (g(L), g(R)) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [-0.11,0.16] for V-R, [-0.08,0.05] for g(L), and [-0.04,0.02] for g(R), at 95{\%} confidence level. Limits on the corresponding Wilson coefficients are also derived.",
optnote="WOS:000562898300001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4514), last updated on Wed, 09 Sep 2020 08:47:33 +0000",
issn="1029-8479",
doi="10.1007/JHEP08(2020)051",
opturl="https://arxiv.org/abs/2005.03799",
opturl="https://doi.org/10.1007/JHEP08(2020)051",
language="English"
}