Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detector

Publikation: Spezielle Publikationen/BeiträgeHervorgehobener Artikel/TitelblattBeigetragenBegutachtung

Beitragende

  • The ATLAS collaboration - , University of Bucharest, iThemba Laboratory for Accelerator Based Sciences, University of Pretoria, Universität von Südafrika, University of Zululand, Cadi Ayyad University, New York University Abu Dhabi, University of Granada, CERN, University of California at Berkeley, University of Georgia (Tbilisi), Yeditepe University, Mohammed VI Polytechnic University (Autor:in)
  • M. Kobel - , Professur für Teilchenphysik (Autor:in)
  • J. Manjarres Ramos - , Centre national de la recherche scientifique (CNRS) (Autor:in)
  • J. E. Nitschke - , Professur für Teilchenphysik (Autor:in)
  • F. Siegert - , Professur für Teilchenphysik (Autor:in)
  • Professur für Experimentelle Teilchenphysik
  • Institut für Kern- und Teilchenphysik (IKTP)
  • Aix-Marseille Université
  • University of Bergen
  • University of Oklahoma
  • Georg-August-Universität Göttingen
  • Technische Universität (TU) Dortmund
  • Brookhaven National Laboratory
  • Southern Methodist University
  • Mohammed V University in Rabat
  • Tel Aviv University
  • Technion-Israel Institute of Technology
  • New York University
  • National Institute for Nuclear Physics
  • Abdus Salam International Centre for Theoretical Physics
  • King's College London (KCL)
  • Universität Heidelberg
  • Laboratoire d'Annecy-le-Vieux de Physique des Particules LAPP
  • AGH University of Science and Technology
  • Brandeis University
  • University of Manchester
  • Northern Illinois University
  • Istanbul University
  • Rutherford Appleton Laboratory
  • University of California at Santa Cruz
  • The University of Chicago
  • Institut de Física d’Altes Energies (IFAE)
  • Università degli Studi di Pavia
  • Johannes Gutenberg-Universität Mainz
  • Alexandru Ioan Cuza University of Iaşi
  • Azerbaijan National Academy of Sciences (ANAS)
  • McGill University
  • Royal Holloway University of London
  • Zhengzhou University
  • University of Rome Tor Vergata

Abstract

This Letter presents the first study of the energy dependence of diboson polarization fractions in WZ → ℓνℓ′ℓ′(ℓ,ℓ′ = e; μ) production. The dataset used corresponds to an integrated luminosity of 140 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 < pZT ≤ 200 GeV and 1.6 standard deviations in the region with pZT > 200 GeV, where pZT 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 ΔY(ℓWZ) and ΔYℓWZ) 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 ΔY(ℓWZ) and ΔY(WZ) distributions are also measured and compared to theoretical predictions.

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Externe IDs

PubMed 39303233
ORCID /0000-0003-0546-1634/work/180372333