Observation of WZγ Production in pp Collisions at s=13TeV with the ATLAS Detector

Collaboration
May 26, 2023
21 pages
Published in:
  • Phys.Rev.Lett. 132 (2024) 2, 021802
  • Published: Jan 12, 2024
e-Print:
Report number:
  • CERN-EP-2023-095
Experiments:

Citations per year

2022202320240310
Abstract: (APS)
This Letter reports the observation of WZγ production and a measurement of its cross section using 140.1±1.2fb-1 of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The WZγ production cross section, with both the W and Z bosons decaying leptonically, ppWZγ±ν+-γ (()=e, μ), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross section is found to be 2.01±0.30(stat)±0.16(syst)fb. The corresponding standard model predicted cross section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50±0.06fb. The observed significance of the WZγ signal is 6.3σ, compared with an expected significance of 5.0σ.
Note:
  • p p: scattering
  • p p: colliding beams
  • W: associated production
  • Z0: associated production
  • photon: associated production
  • W: leptonic decay
  • Z0: leptonic decay
  • channel cross section: calculated
  • electroweak interaction: coupling constant
  • perturbation theory: higher-order