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ATLAS Collaboration(Aad, G. et al), Ahuja, S., Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., et al. (2026). Observation of W+W-γ production in pp collisions at √s=13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings. Phys. Lett. B, 873, 140050–21pp.
Abstract: This Letter reports the observation of W+W-gamma triboson production in 140 fb(-1) of data collected by the ATLAS detector from proton-proton collisions at a centre-of-mass energy of root s = 13 TeV at the LHC. Events with an opposite-charge e μpair, a high transverse-momentum photon, and significant missing transverse momentum are considered. The observed (expected) significance of the signal is 5.9 (6.0) standard deviations. The measured fiducial cross-section, defined for the W+W-gamma -> e(+/-)mu(-/+)nu(nu) over bar gamma final state is 6.2 +/- 0.8 (stat.) +/- 0.6 (sys.) fb, in good agreement with the Standard Model prediction of 6.1(-0.7)(+1.0) fb. Constraints on the Wilson coefficients of 13 dimension-8 operators describing physics beyond the Standard Model through anomalous quartic gauge-boson couplings are derived using the effective field theory framework.
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