1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>CERN İşbirliği</dc:creator>
  <dc:date>2019-01-01</dc:date>
  <dc:description>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.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/105967</dc:identifier>
  <dc:identifier>oai:zenodo.org:105967</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>Physical Review D 99(7)</dc:source>
  <dc: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</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>