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Start date: 2010End date: 2019Author: search.filters.author.Aad, GeorgesSubject: search.filters.subject.Hadron-hadron Scattering (experiments)Subject: search.filters.subject.Beyond Standard ModelHas files: No

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    Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at √s=13 TeV
    (Springer Verlag, 2018) Aaboud, M.; Aad, Georges; Abbott, Brad K.; Abdinov, O. B.; Abeloos, Baptiste; Abidi, Syed Hani; AbouZeid, O. S.; Abraham, Nicola L.; Abramowicz, Halina; Abreu, Henso; Aaboud, M., Faculté des Sciences Aïn Chock, Casablanca, Morocco; Aad, Georges, School of Physics and Astronomy, The University of Manchester, Manchester, United Kingdom; Abbott, Brad K., Faculty of Science, Okayama University, Okayama, Japan; Abdinov, O. B., Azerbaijan National Academy of Sciences, Baku, Azerbaijan; Abeloos, Baptiste, Center for High Energy Physics, University of Oregon, Eugene, United States; Abidi, Syed Hani, Graduate School of Science and Technology, Tokyo Metropolitan University, Hachioji, Japan; AbouZeid, O. S., Faculty of Science, Université Mohammed Premier Oujda, Oujda, Morocco; Abraham, Nicola L., Oskar Klein Centre, Stockholm, Sweden; Abramowicz, Halina, School of Physics, The University of Sydney, Sydney, Australia; Abreu, Henso, University of Sussex, Brighton, United Kingdom
    A search is conducted for a beyond-the-Standard-Model boson using events where a Higgs boson with mass 125 GeV decays to four leptons (ℓ = e or μ). This decay is presumed to occur via an intermediate state which contains one or two on-shell, promptly decaying bosons: H → ZX/XX → 4ℓ, where X is a new vector boson Zd or pseudoscalar a with mass between 1 and 60 GeV. The search uses pp collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 36.1 fb−1 at a centre-of-mass energy s=13 TeV. No significant excess of events above Standard Model background predictions is observed, therefore, upper limits at 95% confidence level are set on modelindependent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models.[Figure not available: see fulltext.]. © 2025 Elsevier B.V., All rights reserved.