1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevD.99.052009", 
  "abstract": "<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>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review D", 
  "id": "106059", 
  "issue": "5", 
  "issued": {
    "date-parts": [
      [
        2019, 
        1, 
        1
      ]
    ]
  }, 
  "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", 
  "type": "article-journal", 
  "volume": "99"
}