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

ATLAS Collaboration

doi: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

ATLAS Collaboration

Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

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^∓𝜈𝜈¯𝛾 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.

Original language	English
Article number	140050
Journal	Physics Letters B
Early online date	29 Nov 2025
DOIs	https://doi.org/10.1016/j.physletb.2025.140050
Publication status	E-pub ahead of print - 29 Nov 2025

Bibliographical note

43 pages in total, author list starting page 26, 4 figures, 5 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-28/

Keywords

hep-ex

Access to Document

10.1016/j.physletb.2025.140050Licence: Creative Commons: Attribution (CC BY)

ATLAS2025Observation_preproofProof, 1.34 MBLicence: Creative Commons: Attribution (CC BY)

Probing New Physics in Photon-Photon Collisions at the LHC
Newman, P. (Principal Investigator)
The Royal Society
12/12/23 → 11/12/26
Project: Research Councils

Cite this

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title = "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",

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∓𝜈𝜈¯𝛾 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.",

keywords = "hep-ex",

author = "\{ATLAS Collaboration\} and Phil Allport and Panagiotis Bellos and Ilyas Benaoumeur and David Charlton and Andrew Chisholm and Aleksandra Dimitrievska and Laura Gonella and Chris Hawkes and Stephen Hillier and Karol Krizka and Eric Liu and Josh Lomas and Thomas Neep and Paul Newman and Eleni Skorda and Jurgen Thomas and Paul Thompson and Alan Watson and Miriam Watson",

note = "43 pages in total, author list starting page 26, 4 figures, 5 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-28/",

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language = "English",

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T1 - 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

AU - ATLAS Collaboration

AU - Allport, Phil

AU - Bellos, Panagiotis

AU - Benaoumeur, Ilyas

AU - Charlton, David

AU - Chisholm, Andrew

AU - Dimitrievska, Aleksandra

AU - Gonella, Laura

AU - Hawkes, Chris

AU - Hillier, Stephen

AU - Krizka, Karol

AU - Liu, Eric

AU - Lomas, Josh

AU - Neep, Thomas

AU - Newman, Paul

AU - Skorda, Eleni

AU - Thomas, Jurgen

AU - Thompson, Paul

AU - Watson, Alan

AU - Watson, Miriam

N1 - 43 pages in total, author list starting page 26, 4 figures, 5 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-28/

PY - 2025/11/29

Y1 - 2025/11/29

N2 - 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∓𝜈𝜈¯𝛾 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.

AB - 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∓𝜈𝜈¯𝛾 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.

KW - hep-ex

UR - https://www.sciencedirect.com/journal/physics-letters-b

U2 - 10.1016/j.physletb.2025.140050

DO - 10.1016/j.physletb.2025.140050

M3 - Letter

SN - 0370-2693

JO - Physics Letters B

JF - Physics Letters B

M1 - 140050

ER -