5 Eylül 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevLett.133.101802", 
  "abstract": "<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>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review Letters", 
  "id": "274725", 
  "issue": "10", 
  "issued": {
    "date-parts": [
      [
        2024, 
        9, 
        5
      ]
    ]
  }, 
  "title": "Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in $WZ$ Production with the ATLAS Detector", 
  "type": "article-journal", 
  "volume": "133"
}