Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed

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

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    Measurements of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at √s=8 TeV
    (Springer Verlag [email protected], 2017) Aaboud, M.; Aad, Georges; Abbott, Brad K.; Abdallah, Jalal Mohamad; Abdinov, O. B.; Abeloos, Baptiste; AbouZeid, O. S.; Abraham, Nicola L.; Abramowicz, Halina; Abreu, Henso; Aaboud, M., Faculté des Sciences Rabat, Rabat, Morocco; Aad, Georges, Department of Physics, University of Massachusetts Amherst, Amherst, United States; Abbott, Brad K., Department of Physics, Oklahoma State University, Stillwater, United States; Abdallah, Jalal Mohamad, Department of Physics, The University of Texas at Arlington, Arlington, United States; Abdinov, O. B., Azerbaijan National Academy of Sciences, Baku, Azerbaijan; Abeloos, Baptiste, The University of Osaka, Suita, Japan; AbouZeid, O. S., Department of Physics, University of Washington, Seattle, United States; Abraham, Nicola L., School of Physics, The University of Sydney, Sydney, Australia; Abramowicz, Halina, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece; Abreu, Henso, Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv-Yafo, Israel
    Same- and opposite-sign charge asymmetries are measured in lepton+jets tt¯ events in which a b-hadron decays semileptonically to a soft muon, using data corresponding to an integrated luminosity of 20.3 fb−1 from proton-proton collisions at a centre-of-mass energy of s=√8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. The charge asymmetries are based on the charge of the lepton from the top-quark decay and the charge of the soft muon from the semileptonic decay of a b-hadron and are measured in a fiducial region corresponding to the experimental acceptance. Four CP asymmetries (one mixing and three direct) are measured and are found to be compatible with zero and consistent with the Standard Model.[Figure not available: see fulltext.] © 2018 Elsevier B.V., All rights reserved.
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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.