This Letter reports the observation of 𝑊 +𝑊 −𝛾 triboson production in 140 fb−1 of data collected by the ATLAS detector from proton–proton collisions at a centre-of-mass energy of √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 −𝛾 → 𝑒±𝜇∓𝜈 ̄𝜈𝛾 final state is 6.2 ± 0.8 (stat.) ± 0.6 (sys.) fb, in good agreement with the Standard Model prediction of 6.1+1.0−0.7 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. (2025). 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. PHYSICS LETTERS. SECTION B, 873, 1-21 [10.1016/j.physletb.2025.140050].

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

Alberghi, G. L.;Alfonsi, F.;Ballabene, E.;Bellagamba, L.;Bianco, G.;Boscherini, D.;Bruni, A.;Carratta, G.;Clissa, L.;Cremonini, D.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Giacobbe, B.;Lasagni Manghi, F.;Levrini, G.;Nechaeva, S.;Polini, A.;Rinaldi, L.;Romano, M.;Sanzani, E.;Sbarra, C.;Sbrizzi, A.;Semprini-Cesari, N.;Sioli, M.;Todome, K.;Valentinetti, S.;Villa, M.;Vittori, C.;Vivarelli, I.;Zoccoli, A.;
2025

Abstract

This Letter reports the observation of 𝑊 +𝑊 −𝛾 triboson production in 140 fb−1 of data collected by the ATLAS detector from proton–proton collisions at a centre-of-mass energy of √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 −𝛾 → 𝑒±𝜇∓𝜈 ̄𝜈𝛾 final state is 6.2 ± 0.8 (stat.) ± 0.6 (sys.) fb, in good agreement with the Standard Model prediction of 6.1+1.0−0.7 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.
2025
Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N.J., et al. (2025). Observation of �� +�� −�� production in ���� collisions at √�� = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings. PHYSICS LETTERS. SECTION B, 873, 1-21 [10.1016/j.physletb.2025.140050].
Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abulaiti, Y...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1087072
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