5 Eylül 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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{
  "@context": "https://schema.org/", 
  "@id": 274725, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "CERN", 
      "name": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "datePublished": "2024-09-05", 
  "description": "<p>This Letter presents the first study of the energy dependence of diboson polarization fractions in $WZ\\to \\ell \\nu {\\ell }^{\\prime }{\\ell }^{\\prime }\\left(\\ell ,{\\ell }^{\\prime }=e,\\mu \\right)$ production. The dataset used corresponds to an integrated luminosity of $140\\text{}\\text{}{\\mathrm{fb}}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with $100&lt;{p}_{T}^{Z}\\le 200\\text{}\\text{}\\mathrm{GeV}$ and 1.6 standard deviations in the region with ${p}_{T}^{Z}&gt;200\\text{}\\text{}\\mathrm{GeV}$, where ${p}_{T}^{Z}$ is the transverse momentum of the $Z$ boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the $\\Delta Y\\left({\\ell }_{W}Z\\right)$ and $\\Delta Y\\left(WZ\\right)$ distributions defined respectively as the rapidity difference between the lepton from the $W$ boson decay and the $Z$ boson and the rapidity difference between the $W$ boson and the $Z$ boson. Significant suppression of events near zero is observed in both distributions. Unfolded $\\Delta Y\\left({\\ell }_{W}Z\\right)$ and $\\Delta Y\\left(WZ\\right)$ distributions are also measured and compared to theoretical predictions.</p>", 
  "headline": "Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in $WZ$ Production with the ATLAS Detector", 
  "identifier": 274725, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in $WZ$ Production with the ATLAS Detector", 
  "url": "https://aperta.ulakbim.gov.tr/record/274725"
}