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@ARTICLE{Aad:646432,
      author       = {Aad, Georges and others},
      collaboration = {{ATLAS Collaboration}},
      title        = {{O}bservation of {W}+{W}−γ production in pp collisions
                      at s = 13 {T}e{V} with the {ATLAS} detector and constraints
                      on anomalous quartic gauge-boson couplings},
      journal      = {Physics letters / B},
      volume       = {873},
      issn         = {0031-9163},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {PUBDB-2026-00853, arXiv:2509.14070. CERN-EP-2025-187.
                      arXiv:2509.14070. CERN-EP-2025-187},
      pages        = {140050 -},
      year         = {2026},
      note         = {Phys. Lett. B 873 (2026) 140050. 43 pages in total, author
                      list starting page 26, 6 figures, 5 tables. All figures
                      including auxiliary figures are available at
                      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-28/},
      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
                      6.1−0.7+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.},
      keywords     = {Electroweak (autogen) / Multiboson (autogen) / WWgamma
                      (autogen) / Cross-section (autogen) / Anomalous quartic
                      gauge couplings (autogen) / EFT (autogen)},
      cin          = {ATLAS},
      ddc          = {530},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)469666862 - Präzisionstests des
                      Standardmodells unter der Verwendung von geboosteten
                      W/Z-Bosonen am Large Hadron Collider (469666862) / REALDARK
                      - REAL-time discovery strategies for DARK matter and dark
                      sector signals at the ATLAS detector with Run-3 LHC data
                      (101002463) / BARD - B-resonance Algorithm using Rare Decays
                      (101116429) / DITTO - Comprehensive search for new phenomena
                      in the dilepton spectrum at the LHC (101089007) / SMASH -
                      Machine learning for Sciences and Humanities (101081355)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)469666862 /
                      G:(EU-Grant)101002463 / G:(EU-Grant)101116429 /
                      G:(EU-Grant)101089007 / G:(EU-Grant)101081355},
      experiment   = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2509.14070},
      howpublished = {arXiv:2509.14070},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2509.14070;\%\%$},
      doi          = {10.1016/j.physletb.2025.140050},
      url          = {https://bib-pubdb1.desy.de/record/646432},
}