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We present a calculation of the O(alpha_s) QCD corrections to the productionof a Z boson in association with two photons and to triple photon production athadron colliders. All final-state photons are taken as real. For the Z boson,we consider the decays both into charged leptons and into neutrinos includingall off-shell effects. Numerical results are obtained via a Monte Carlo programbased on the structure of the VBFNLO program package. This allows us toimplement general cuts and distributions of the final-state particles. We findthat the NLO QCD corrections are sizable and significantly exceed theexpectations from a scale variation of the leading-order result. In addition,differential distributions of important observables change considerably. Theprediction of two-photon-associated Z production with Z decays into neutrinosfrom the charged-lepton rate works well, once we use an additional cut on theinvariant mass of the charged-lepton pair.

Z\gamma\gamma production with leptonic decays and triple photon production at NLO QCD