Search for anomalous Wtb couplings and flavour-changing neutral currents in t -channel single top quark production in pp collisions at √s = 7 and 8 TeV

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dc.contributor.author CMS Collaboration
dc.contributor.author Charaf, O.
dc.contributor.author Cooper, S.I.
dc.contributor.author Henderson, C.
dc.contributor.author Rumerio, P.
dc.date.accessioned 2022-08-02T15:16:15Z
dc.date.available 2022-08-02T15:16:15Z
dc.date.issued 2017
dc.identifier.citation Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., … Woods, N. (2017). Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at s = 7 $ \sqrt{s}=7 $ and 8 TeV. In Journal of High Energy Physics (Vol. 2017, Issue 2). Springer Science and Business Media LLC. https://doi.org/10.1007/jhep02(2017)028 en_US
dc.identifier.uri https://ir.ua.edu/handle/123456789/8926
dc.description.abstract Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at s = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 fb⁻¹, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be |\(f_{V}^{R}\)| < 0.16, |\(f_{T}^{L}\)| < 0.057, and − 0.049 < \(f_{T}^{R}\) < 0.048, respectively. For the FCNC couplings \(κ_{tug}\) and \(κ_{tcg}\), the 95% CL upper limits on coupling strengths are |\(κ_{tug}\)|/ Λ < 4.1 × 10\(^{−3}\) TeV\(^{−1}\) and |\(κ_{tcg}\)|/ Λ < 1.8 × 10\(^{−2}\) TeV\(^{−1}\), where Λ is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 × 10\(^{−5}\) and 4.1 × 10\(^{−4}\) for the decays t → ug and t → cg, respectively. en_US
dc.description.uri https://doi.org/10.1007/JHEP02(2017)028
dc.format.mimetype application/pdf
dc.language English
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.subject High Energy Physics - Experiment en_US
dc.subject Flavour Changing Neutral Currents en_US
dc.subject Hadron-Hadron scattering (experiments) en_US
dc.subject Top physics en_US
dc.title Search for anomalous Wtb couplings and flavour-changing neutral currents in t -channel single top quark production in pp collisions at √s = 7 and 8 TeV en_US
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