1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/105967</identifier>
  <creators>
    <creator>
      <creatorName>CERN İşbirliği</creatorName>
      <affiliation>CERN</affiliation>
    </creator>
  </creators>
  <titles>
    <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</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2019</publicationYear>
  <dates>
    <date dateType="Issued">2019-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/105967</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/PhysRevD.99.072009</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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 ${\sigma }_{t\overline{t}Z}=0.95±0.0{8}_{\mathrm{stat}}±0.1{0}_{\mathrm{syst}}\text{}\text{}\mathrm{pb}$ and ${\sigma }_{t\overline{t}W}=0.87±0.1{3}_{\mathrm{stat}}±0.1{4}_{\mathrm{syst}}\text{}\text{}\mathrm{pb}$ 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.&lt;/p&gt;</description>
  </descriptions>
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