1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevD.99.072009", 
  "abstract": "<p>A measurement of the associated production of a top-quark pair ($t\\overline{t}$) with a vector boson ($W$, $Z$) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using $36.1\\text{}\\text{}{\\mathrm{fb}}^{-1}$ of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The $t\\overline{t}Z$ and $t\\overline{t}W$ production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are ${\\sigma }_{t\\overline{t}Z}=0.95\u00b10.0{8}_{\\mathrm{stat}}\u00b10.1{0}_{\\mathrm{syst}}\\text{}\\text{}\\mathrm{pb}$ and ${\\sigma }_{t\\overline{t}W}=0.87\u00b10.1{3}_{\\mathrm{stat}}\u00b10.1{4}_{\\mathrm{syst}}\\text{}\\text{}\\mathrm{pb}$ in agreement with the Standard Model predictions. The measurement of the $t\\overline{t}Z$ cross section is used to set constraints on effective field theory operators which modify the $t\\overline{t}Z$ vertex.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review D", 
  "id": "105967", 
  "issue": "7", 
  "issued": {
    "date-parts": [
      [
        2019, 
        1, 
        1
      ]
    ]
  }, 
  "title": "Measurement of the $t\\overline{t}Z$ and $t\\overline{t}W$ cross sections in proton-proton collisions at $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ with the ATLAS detector", 
  "type": "article-journal", 
  "volume": "99"
}