Search for the Exclusive W Boson Hadronic Decays W±π±γ, W±K±γ and W±ρ±γ with the ATLAS Detector

Collaboration
Sep 27, 2023
36 pages
Published in:
  • Phys.Rev.Lett. 133 (2024) 16, 161804
  • Published: Oct 17, 2024
e-Print:
Report number:
  • CERN-EP-2023-211
Experiments:

Citations per year

2023202420252
Abstract: (APS)
A search for the exclusive hadronic decays W±π±γ, W±K±γ, and W±ρ±γ is performed using up to 140fb-1 of proton-proton collisions recorded with the ATLAS detector at a center-of-mass energy of s=13TeV. If observed, these rare processes would provide a unique test bench for the quantum chromodynamics factorization formalism used to calculate cross sections at colliders. Additionally, at future colliders, these decays could offer a new way to measure the W boson mass through fully reconstructed decay products. The search results in the most stringent upper limits to date on the branching fractions B(W±π±γ)<1.9×10-6, B(W±K±γ)<1.7×10-6, B(W±ρ±γ)<5.2×10-6 at 95% confidence level.
Note:
  • p p: colliding beams
  • W: mass
  • W: coupling
  • W: hadronic decay
  • pi
  • K
  • rho(770)
  • p p: scattering
  • W: radiative decay
  • W: rare decay