Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector

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dc.authorscopusidAndrew John Beddall / 57215802986
dc.authorscopusidSerkant Ali Çetin / 34567544400
dc.authorscopusidSertaç Öztürk / 56421488400
dc.authorscopusidSinem Şimşek / 57210344387
dc.authorscopusidZekeriya Uysal / 57210345628
dc.authorwosidAndrew John Beddall / AAE-5820-2022
dc.authorwosidSertaç Öztürk / AGO-2476-2022
dc.authorwosidSerkant Ali Çetin / AGF-0147-2022
dc.authorwosidSinem Şimşek / AGG-2640-2022
dc.authorwosidZekeriya Uysal / AAD-1226-2019
dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorBeddall, Andrew John
dc.contributor.authorÇetin, Serkant Ali
dc.contributor.authorÖztürk, Sertaç
dc.contributor.authorŞimşek, Sinem
dc.contributor.authorUysal, Zekeriya
dc.date.accessioned2025-04-18T10:46:50Z
dc.date.available2025-04-18T10:46:50Z
dc.date.issued2024
dc.departmentİstinye Üniversitesi, Rektörlük, Temel Bilimler Bölümü
dc.description.abstractA search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (q=u,c) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a τ+τ- pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are tt¯ and Ht production. For the tt¯ production, one top quark decays via t→Hq. The proton–proton collision data set analysed amounts to (140fb-1) at (s=13TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t→Hq branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(t→Hu)<2.8(3.0)×10-4 and B(t→Hc)<3.3(3.8)×10-4. Combining this search with other searches for tHq flavour-changing neutral-current interactions previously conducted by ATLAS, considering H→bb¯ and H→γγ decays, as well as H→τ+τ- decays with one or two hadronically decaying τ-leptons, yields observed (expected) upper limits on the branching ratios of B(t→Hu)<2.6(1.8)×10-4 and B(t→Hc)<3.4(2.3)×10-4.
dc.identifier.citationATLAS Collaboration atlas. publications@ cern. ch, Aad, G., Aakvaag, E., Abbott, B., Abeling, K., Abicht, N. J., ... & Baines, J. T. (2024). Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector. The European Physical Journal C, 84(7), 757.
dc.identifier.doi10.1140/epjc/s10052-024-12994-1
dc.identifier.issn14346044
dc.identifier.issue7
dc.identifier.scopus2-s2.0-85200554324
dc.identifier.scopusqualityQ1
dc.identifier.urihttp://dx.doi.org/10.1140/epjc/s10052-024-12994-1
dc.identifier.urihttps://hdl.handle.net/20.500.12713/7182
dc.identifier.volume84
dc.indekslendigikaynakScopus
dc.institutionauthorBeddall, Andrew John
dc.institutionauthorÇetin, Serkant Ali
dc.institutionauthorÖztürk, Sertaç
dc.institutionauthorŞimşek, Sinem
dc.institutionauthorUysal, Zekeriya
dc.institutionauthoridAndrew John Beddall / 0000-0002-8451-9672
dc.institutionauthoridSerkant Ali Çetin / 0000-0001-5050-8441
dc.institutionauthoridSertaç Öztürk / 0000-0001-6533-6144
dc.institutionauthoridSinem Şimşek / 0000-0002-9650-3846
dc.institutionauthoridZekeriya Uysal / 0000-0002-7110-8065
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofEuropean physical journal c
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleSearch for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector
dc.typeArticle

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