Chekhovsky, V.Hayrapetyan, A.Makarenko, V.Tumasyan, A.Adam, W.Andrejkovic, J. W.Benato, L.2026-04-252026-04-2520252470-00102470-0029https://doi.org/10.1103/cm24-665bhttps://hdl.handle.net/11486/8421A measurement of the WZ gamma triboson production cross section is presented. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of root s = 13 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 fb(-1). The analysis focuses on the final state with three charged leptons, l(+/-)nu l(+)l(-), where l = e or mu, accompanied by an additional photon. The observed (expected) significance of the WZ gamma signal is 5.4 (3.8) standard deviations. The cross section is measured in a fiducial region, where events with an l originating from a tau lepton decay are excluded, to be 5.48 +/- 1.11 fb, which is compatible with the prediction of 3.69 +/- 0.24 fb at next-to-leading order in quantum chromodynamics. Exclusion limits are set on anomalous quartic gauge couplings and on the production cross sections of massive axionlike particles.eninfo:eu-repo/semantics/openAccess#BAŞV!Article112110.1103/cm24-665b2-s2.0-105022922905Q1WOS:001552648100001Q10000-0002-0782-08830000-0001-9748-43360000-0002-9270-56430000-0002-0177-59030000-0003-0510-38100000-0002-2633-46960000-0002-8087-3199