Observation of WZγ Production in pp Collisions at √s=13 TeV with the ATLAS Detector Aad, G. Rodríguez Chala, Mikael Atlas Collaboration, / This Letter reports the observation of WZγ production and a measurement of its cross section using 140.1 ± 1.2 fb−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, pp → WZγ → l'±vl+lγ (l(') = 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 ± 0.06 fb. The observed significance of the WZγ signal is 6.3σ, compared with an expected significance of 5.0σ. 2024-06-07T10:14:41Z 2024-06-07T10:14:41Z 2024-01-12 journal article G. Aad et al. (ATLAS Collaboration). Observation of WZγ Production in pp Collisions at √s=13 TeV with the ATLAS Detector. Phys. Rev. Lett. 132, 021802 (2024) [10.1103/PhysRevLett.132.021802] https://hdl.handle.net/10481/92423 10.1103/PhysRevLett.132.021802 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Physical Society