Aad, G.Abbott, B.Abdallah, J.Abdel Khalek, S.Abdinov, O.Aben, R.Abi, B.Abolins, M.Abouzeid, O.Abramowicz, H.Abreu, H.Abreu, R.Abulaiti, Y.Acharya, B.Adamczyk, L.Adams, D.Adelman, J.Adomeit, S.Adye, T.Agatonovic-Jovin, T.et al.2016-11-202016-11-202015Physical Review Letters, 2015; 115(3):031802-1-031802-180031-90071079-7114http://hdl.handle.net/2440/102631This Letter reports evidence of triple gauge boson production pp → WðlνÞγγ þ X, which is accessible for the first time with the 8 TeV LHC data set. The fiducial cross section for this process is measured in a data sample corresponding to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in 2012. Events are selected using the W boson decay to eν or μν as well as requiring two isolated photons. The measured cross section is used to set limits on anomalous quartic gauge couplings in the high diphoton mass region.en© 2015 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.ATLAS CollaborationJournal article003003227510.1103/PhysRevLett.115.0318020003580249000022-s2.0-84937879291176529