Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
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 luminosit...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaften: | , |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
August 12, 2020
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| In: |
Journal of high energy physics
Year: 2020, Heft: 8 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP08(2020)051 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP08(2020)051
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| Verfasserangaben: | the ATLAS and CMS Collaborations |
MARC
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| 245 | 1 | 0 | |a Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV |c the ATLAS and CMS Collaborations |
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| 246 | 3 | 3 | |a Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at square root s = 8 TeV |
| 246 | 3 | 3 | |a Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at sqrt s = 8 TeV |
| 264 | 1 | |c August 12, 2020 | |
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| 520 | |a 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. | ||
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