Search for top quark decays \(t → qH\), with \(H → γγ\), in \(\sqrt{s} = 13\) TeV \(pp\) collisions using the ATLAS detector

Please always quote using this URN: urn:nbn:de:bvb:20-opus-172568

  • This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (\({q = c, u}\)) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb\(^{−1}\) at \(\sqrt{s} = 13\) TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into \(qH\) and the other decays into \(bW\). Both the hadronic and leptonic decay modes of the \(W\) boson are used. No significantThis article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (\({q = c, u}\)) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb\(^{−1}\) at \(\sqrt{s} = 13\) TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into \(qH\) and the other decays into \(bW\). Both the hadronic and leptonic decay modes of the \(W\) boson are used. No significant excess is observed and an upper limit is set on the \({t → cH}\) branching ratio of 2.2 × 10\(^{−3}\) at the 95% confidence level, while the expected limit in the absence of signal is 1.6 × 10\(^{−3}\). The corresponding limit on the \(tcH\) coupling is 0.090 at the 95% confidence level. The observed upper limit on the \({t → uH}\) branching ratio is 2.4 × 10\(^{−3}\).show moreshow less

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Metadaten
URN:urn:nbn:de:bvb:20-opus-172568
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie
Language:English
Parent Title (English):Journal of High Energy Physics
Year of Completion:2017
Volume:2017
Issue:10
Article Number:129
Source:Journal of High Energy Physics (2017) 10:129. https://doi.org/10.1007/JHEP10(2017)129
DOI:https://doi.org/https://doi.org/10.1007/JHEP10(2017)129
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 539 Moderne Physik
Tag:Flavour changing neutral currents; Hadron-Hadron scattering (experiments); Higgs physics; High energy physics; Top physics
Release Date:2021/05/25
Creating Corporation:The ATLAS Collaboration
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International