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Probing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at √s = 8 TeV with the ATLAS detector

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    SYSNO ASEP0487361
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleProbing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at √s = 8 TeV with the ATLAS detector
    Author(s) Aaboud, M. (MA)
    Aad, G. (FR)
    Abbott, B. (US)
    Chudoba, Jiří (FZU-D) RID, ORCID
    Havránek, Miroslav (FZU-D) RID
    Hejbal, Jiří (FZU-D) RID, ORCID
    Hladík, Ondřej (FZU-D) ORCID
    Jakoubek, Tomáš (FZU-D) RID, ORCID
    Kepka, Oldřich (FZU-D) RID, ORCID
    Kupčo, Alexander (FZU-D) RID, ORCID
    Kůs, Vlastimil (FZU-D) RID
    Lokajíček, Miloš (FZU-D) RID, ORCID
    Lysák, Roman (FZU-D) RID, ORCID
    Marčišovský, Michal (FZU-D) RID, ORCID
    Mikeštíková, Marcela (FZU-D) RID, ORCID
    Němeček, Stanislav (FZU-D) RID, ORCID
    Penc, Ondřej (FZU-D) ORCID
    Šícho, Petr (FZU-D) RID, ORCID
    Staroba, Pavel (FZU-D) RID, ORCID
    Svatoš, Michal (FZU-D) RID, ORCID
    Taševský, Marek (FZU-D) RID, ORCID
    Vrba, Václav (FZU-D) RID
    Number of authors2852
    Article number124
    Source TitleJournal of High Energy Physics. - : Springer - ISSN 1029-8479
    Roč. 2017, č. 4 (2017), s. 1-50
    Number of pages50 s.
    Languageeng - English
    CountryUS - United States
    KeywordsATLAS ; CERN LHC Coll ; hadronization ; final state ; ((n)jet lepton) ; parton ; experimental results ; 8000 GeV-cms
    Subject RIVBF - Elementary Particles and High Energy Physics
    OECD categoryParticles and field physics
    Institutional supportFZU-D - RVO:68378271
    UT WOS000400278200001
    EID SCOPUS85018280474
    DOI10.1007/JHEP04(2017)124
    AnnotationTo probe the Wtb vertex structure, top-quark and W-boson polarisation observables are measured from t-channel single-top-quark events produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb(-1), recorded with the ATLAS detector at the LHC. Selected events contain one isolated electron or muon, large missing transverse momentum and exactly two jets, with one of them identified as likely to contain a b-hadron. Stringent selection requirements are applied to discriminate t-channel single-top-quark events from background. The polarisation observables are extracted from asymmetries in angular distributions measured with respect to spin quantisation axes appropriately chosen for the top quark and the W boson. The asymmetry measurements are performed at parton level by correcting the observed angular distributions for detector effects and hadronisation after subtracting the background contributions. The measured top-quark and W-boson polarisation values are in agreement with the Standard Model predictions. Limits on the imaginary part of the anomalous coupling gR are also set from model-independent measurements.
    WorkplaceInstitute of Physics
    ContactKristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
    Year of Publishing2018
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