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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

Publication ,  Journal Article
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, NJ; Abidi, SH; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
February 1, 2026

This Letter reports the observation of W+Wγ 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+Wγ→e±μνν¯γ 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.

Duke Scholars

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

ISSN

0370-2693

Publication Date

February 1, 2026

Volume

873

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
 

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Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., Abicht, N. J., … Antonelli, M. (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. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 873. https://doi.org/10.1016/j.physletb.2025.140050
Aad, G., E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, et al. “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 Nuclear Elementary Particle and High Energy Physics 873 (February 1, 2026). https://doi.org/10.1016/j.physletb.2025.140050.
Aad G, Aakvaag E, Abbott B, Abdelhameed S, Abeling K, Abicht NJ, et al. 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 Nuclear Elementary Particle and High Energy Physics. 2026 Feb 1;873.
Aad, G., et al. “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 Nuclear Elementary Particle and High Energy Physics, vol. 873, Feb. 2026. Scopus, doi: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, Ackermann A, Adam Bourdarios C, Adamczyk L, Addepalli SV, Addison MJ, Adelman J, Adiguzel A, Adye T, Affolder AA, Afik Y, Agaras MN, Aggarwal A, Agheorghiesei C, Ahmadov F, Ahuja S, Ai X, Aielli G, Aikot A, Ait Tamlihat M, Aitbenchikh B, Akbiyik M, Åkesson TPA, Akimov AV, Akiyama D, Akolkar NN, Aktas S, Alberghi GL, Albert J, Alberti U, Albicocco P, Albouy GL, Alderweireldt S, Alegria ZL, Aleksa M, Aleksandrov IN, Alexa C, Alexopoulos T, Alfonsi F, Algren M, Alhroob M, Ali B, Ali HMJ, Ali S, Alibocus SW, Aliev M, Alimonti G, Alkakhi W, Allaire C, Allbrooke BMM, Allen DR, Allen JS, Allen JF, Allport PP, Aloisio A, Alonso F, Alpigiani C, Alsolami ZMK, Alvarez Fernandez A, Alves Cardoso M, Alviggi MG, Aly M, Coutinho YA, Ambler A, Amelung C, Amerl M, Ames CG, Amezza T, Amidei D, Amini B, Amirie K, Amirkhanov A, Amor Dos Santos SP, Amos KR, Amperiadou D, An S, Anastopoulos C, Andeen T, Anders JK, Anderson AC, Andreazza A, Angelidakis S, Angerami A, Anisenkov AV, Annovi A, Antel C, Antipov E, Antonelli M. 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 Nuclear Elementary Particle and High Energy Physics. 2026 Feb 1;873.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

ISSN

0370-2693

Publication Date

February 1, 2026

Volume

873

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences