1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>A search for four-top-quark production, $t\\overline{t}t\\overline{t}$, is presented. It is based on proton-proton collision data with a center-of-mass energy $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ collected by the ATLAS detector at the Large Hadron Collider during the years 2015 and 2016, corresponding to an integrated luminosity of $36.1\\text{}\\text{}{\\mathrm{fb}}^{-1}$. Data are analyzed in both the single-lepton and opposite-sign dilepton channels, characterized by the presence of one or two isolated electrons or muons with high-transverse momentum and multiple jets. A data-driven method is used to estimate the dominant background from top-quark pair production in association with jets. No significant excess above the Standard Model expectation is observed. The result is combined with the previous same-sign dilepton and multilepton searches carried out by the ATLAS Collaboration and an observed (expected) upper limit of 5.3 (2.1) times the four-top-quark Standard Model cross section is obtained at 95% confidence level. Additionally, an upper limit on the anomalous four-top-quark production cross section is set in the context of an effective field theory model.</p>", 
    "doi": "10.1103/PhysRevD.99.052009", 
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      "issue": "5", 
      "title": "Physical Review D", 
      "volume": "99"
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    "publication_date": "2019-01-01", 
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    "title": "Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in $pp$ collisions at $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ with the ATLAS detector"
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