Search for Anomalous Couplings in the Wtb Vertex from the Measurement of Double Differential Angular Decay Rates of Single Top Quarks Produced in the T-Channel with the ATLAS Detector

dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAben, R.en_US
dc.contributor.authorAbolins, M.en_US
dc.contributor.authorAbouZeid, O. S.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorLeyton, Michaelen_US
dc.contributor.authorMeirose, Bernharden_US
dc.contributor.authorNamasivayam, Harisankaren_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.contributor.utdAuthorMeirose, Bernharden_US
dc.contributor.utdAuthorNamasivayam, Harisankaren_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.date.accessioned2017-11-10T23:18:14Z
dc.date.available2017-11-10T23:18:14Z
dc.date.created2016-04-05en_US
dc.date.issued2016-04-05en_US
dc.description.abstractThe electroweak production and subsequent decay of single top quarks is determined by the properties of the Wtb vertex. This vertex can be described by the complex parameters of an effective Lagrangian. An analysis of angular distributions of the decay products of single top quarks produced in the t-channel constrains these parameters simultaneously. The analysis described in this paper uses 4.6 fb⁻¹ of proton-proton collision data at √s̅ = 7 TeV collected with the ATLAS detector at the LHC. Two parameters are measured simultaneously in this analysis. The fraction ʄ₁ of decays containing transversely polarised W bosons is measured to be 0.37 ± 0.07 (stat. ⊕ syst.). The phase δ_ between amplitudes for transversely and longitudinally polarised W bosons recoiling against lefthanded b-quarks is measured to be -0.014 π ± 0.036 π (stat. ⊕ syst.). The correlation in the measurement of these parameters is 0.15. These values result in two-dimensional limits at the 95% confidence level on the ratio of the complex coupling parameters g_R and V_L, yielding R-e[g_R / V_L] ∈ [-0.36; 0.10] and Im[g_R / V_L] ∈ [-0.17; 0.23] with a correlation of 0.11. The results are in good agreement with the predictions of the Standard Model.en_US
dc.identifier.bibliographicCitationAad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2016. "Search for anomalous couplings in the Wtb vertex from the measurement of double differential angular decay rates of single top quarks produced in the t-channel with the ATLAS detector." Journal of High Energy Physics 2016(23), doi:10.1007/JHEP04(2016)023en_US
dc.identifier.issn1029-8479en_US
dc.identifier.issue4en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5580
dc.relation.urihttp://dx.doi.org/10.1007/JHEP04(2016)023
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2016 CERN, for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceJournal of High Energy Physics
dc.subjectTop Quarksen_US
dc.subjectW bosonsen_US
dc.subjectProton-proton interactionsen_US
dc.subjectPolarization (Nuclear physics)en_US
dc.subjectStandard Modelen_US
dc.titleSearch for Anomalous Couplings in the Wtb Vertex from the Measurement of Double Differential Angular Decay Rates of Single Top Quarks Produced in the T-Channel with the ATLAS Detectoren_US
dc.type.genrearticleen_US

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