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Search for flavour-changing neutral tqH interactions with H → γγ in pp collisions at √s=13 TeV 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).ORCID iD: 0000-0002-9766-2670
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-7489-9184
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-3380-8167
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Number of Authors: 29482023 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2023, no 12, article id 195Article in journal (Refereed) Published
Abstract [en]

A search for flavour-changing neutral interactions involving the top quark, the Higgs boson and an up-type quark q (q = c, u) is presented. The proton-proton collision data set used, with an integrated luminosity of 139 fb−1, was collected at √s = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Both the decay process tqH in production and the production process pptH, with the Higgs boson decaying into two photons, are investigated. No significant excess is observed and upper limits are set on the tcH and the tuH branching ratios of 4.3 × 10−4 and 3.8 × 10−4, respectively, at the 95% confidence level, while the expected limits in the absence of signal are 4.7 × 10−4 and 3.9 × 10−4. Combining this search with ATLAS searches in the Hτ+τ and H final states yields observed (expected) upper limits on the tcH branching ratio of 5.8 × 10−4 (3.0 × 10−4) at the 95% confidence level. The corresponding observed (expected) upper limit on the tuH branching ratio is 4.0 × 10−4 (2.4 × 10−4).

Place, publisher, year, edition, pages
2023. Vol. 2023, no 12, article id 195
Keywords [en]
Flavour Changing Neutral Currents, Hadron-Hadron Scattering, Higgs Physics, Top Physics
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-228224DOI: 10.1007/JHEP12(2023)195ISI: 001173325100001OAI: oai:DiVA.org:su-228224DiVA, id: diva2:1851128
Available from: 2024-04-12 Created: 2024-04-12 Last updated: 2024-04-12Bibliographically approved

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Pasuwan, PatrawanPereira Sanchez, LauraRichter, StefanRiefel, Ellen MariaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo

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Andrean, Stefio Y.Backman, FilipBarranco Navarro, LauraBohm, ChristianClément, ChristopheDunne, KatherineHellman, StenIngebretsen Carlson, TomKim, DongwonLee, SuhyunLou, XuanhongMilstead, David A.Pasuwan, PatrawanPereira Sanchez, LauraRichter, StefanRiefel, Ellen MariaSilverstein, Samuel B.Sjölin, JörgenStrandberg, SaraStrübig, AntoniaValdés Santurio, Eduardo
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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