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Search for top quark decays t -> qH,with H -> gamma gamma, in root s=13 TeV pp collisions using the ATLAS detector
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 28622017 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, article id 129Article in journal (Refereed) Published
Abstract [en]

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 root s = 13TeV 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 x 10(-3) at the 95% confidence level, while the expected limit in the absence of signal is 1 : 6 x 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 x 10(-3).

Place, publisher, year, edition, pages
2017. no 10, article id 129
Keywords [en]
Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Higgs physics, Top physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149849DOI: 10.1007/JHEP10(2017)129ISI: 000413664300001OAI: oai:DiVA.org:su-149849DiVA, id: diva2:1167965
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-02-07Bibliographically approved

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Abulaiti, YimingÅkerstedt, HenrikBendtz, KatarinaBertoli, GabrieleBessidskaia Bylund, OlgaBohm, ChristianCarney, Rebecca M. D.Clement, ChristopheCribbs, Wayne A.Gellerstedt, KarlHellman, StenJon-And, KerstinLundberg, OlofMilstead, David A.Moa, TorbjörnMolander, SimonShaikh, Nabila W.Shcherbakova, AnnaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraUghetto, MichaëlValdes Santurio, EduardoWallängen, Veronica
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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