Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb - 1 of ATLAS √s=13 TeV proton–proton collision data

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • The ATLAS collaboration - (Autor:in)
  • Professur für Experimentelle Teilchenphysik
  • Professur für Teilchenphysik
  • Aix-Marseille Université
  • University of Oklahoma
  • University of Massachusetts
  • Georg-August-Universität Göttingen
  • Brookhaven National Laboratory
  • Mohammed V University in Rabat
  • Tel Aviv University
  • Technion-Israel Institute of Technology
  • New York University
  • Pontificia Universidad Católica de Chile
  • National Institute for Nuclear Physics
  • Abdus Salam International Centre for Theoretical Physics
  • King's College London (KCL)
  • Laboratoire d'Annecy-le-Vieux de Physique des Particules LAPP
  • AGH University of Science and Technology
  • University of Toronto
  • Brandeis University
  • Northern Illinois University
  • Istanbul University
  • Universität Genf
  • Rutherford Appleton Laboratory
  • University of California at Santa Cruz
  • CERN
  • Institut de Física d’Altes Energies (IFAE)
  • Università degli Studi di Pavia
  • Johannes Gutenberg-Universität Mainz
  • Alexandru Ioan Cuza University of Iaşi
  • University of Granada
  • Azerbaijan National Academy of Sciences

Abstract

Searches for the exclusive decays of Higgs and Z bosons into a vector quarkonium state and a photon are performed in the μ+μ-γ final state with a proton–proton collision data sample corresponding to an integrated luminosity of 139 fb - 1 collected at s=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into J/ψγ , ψ(2S)γ , and Υ(1S,2S,3S)γ are found to be 2.0 × 10 - 4 , 10.5 × 10 - 4 , and (2.5 , 4.2 , 3.4) × 10 - 4 , respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the Z boson decays are 1.2 × 10 - 6 , 2.4 × 10 - 6 , and (1.1 , 1.3 , 2.4) × 10 - 6 . An observed 95% CL interval of (- 133 , 175) is obtained for the κc/ κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (- 37 , 40) is obtained for κb/ κγ .

Details

OriginalspracheEnglisch
Aufsatznummer781
Seiten (von - bis)1-33
Seitenumfang33
FachzeitschriftEuropean Physical Journal C
Jahrgang83
Ausgabenummer9
PublikationsstatusVeröffentlicht - 5 Sept. 2023
Peer-Review-StatusJa

Externe IDs

ORCID /0000-0001-6480-6079/work/172566397
ORCID /0000-0003-0546-1634/work/173516639