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The observation of WW$\gamma$ production in proton-proton collisions at acenter-of-mass energy of 13 TeV with an integrated luminosity of 138 fb$^{-1}$is presented. The observed (expected) significance is 5.6 (4.7) standarddeviations. Events are selected by requiring exactly two leptons (one electronand one muon) of opposite charge, moderate missing transverse momentum, and aphoton. The measured fiducial cross section for WW$\gamma$ is 6.0 $\pm$ 0.8(stat) $\pm$ 0.7 (syst) $\pm$ 0.6 (modeling) fb, in agreement with thenext-to-leading order quantum chromodynamics prediction. The analysis isextended with a search for the associated production of the Higgs boson and aphoton, which is generated by a coupling of the Higgs boson to light quarks.The result is used to constrain the Higgs boson couplings to light quarks.

Observation of WW$\gamma$ production and search for H$\gamma$ production in proton-proton collisions at $\sqrt{s}$ = 13 TeV