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 eμ pair, 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 nubar 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.

Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). Observation of W+ W− gamma production in pp collisions at root s = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings. PHYSICS LETTERS. SECTION B, 873 [10.1016/j.physletb.2025.140050].

Observation of W+ W− gamma production in pp collisions at root s = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

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 eμ pair, 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 nubar 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.
2026
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Anomalous quartic gauge couplings
Cross-section
EFT
Electroweak
Multiboson
WWgamma
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.j., et al. (2026). Observation of W+ W− gamma production in pp collisions at root s = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings. PHYSICS LETTERS. SECTION B, 873 [10.1016/j.physletb.2025.140050].
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Acharya, Bs;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/450186
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