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Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s = 8 TeV

ATLAS Collaboration; CMS Collaboration; 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.; ... mehr

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 fb1 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 (F0) 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. ... mehr

Zugehörige Institution(en) am KIT Fakultät für Physik – Institut für Experimentelle Kernphysik (IEKP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2020
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000124557
HGF-Programm 51.03.03 (POF III, LK 01) Kosmische Strahlung Auger
Erschienen in Journal of high energy physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2020
Heft 8
Seiten Art.-Nr.: 51
Vorab online veröffentlicht am 12.08.2020
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Verlagsausgabe §
DOI: 10.5445/IR/1000124557
Veröffentlicht am 13.10.2020
Originalveröffentlichung
DOI: 10.1007/JHEP08(2020)051
Scopus
Zitationen: 28
Web of Science
Zitationen: 85
Dimensions
Zitationen: 17
Seitenaufrufe: 259
seit 13.10.2020
Downloads: 177
seit 19.10.2020
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