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We present the first observation of the Zgamma to nunugamma process at theTevatron at 5.1 standard deviations significance, based on 3.6 fb-1 ofintegrated luminosity collected with the D0 detector at the Fermilab Tevatronppbar Collider at sqrt{s} = 1.96 TeV. The measured Zgamma cross sectionmultiplied by the branching fraction of Z to nunu is 32 +- 9 (stat.+syst.) +- 2(lumi.) fb for the photon ET > 90 GeV. It is in agreement with the standardmodel prediction of 39 +- 4 fb. We set the most restrictive limits on anomaloustrilinear Zgammagamma and ZZgamma gauge boson couplings at a hadron collider todate, with three constraints being the world's strongest.

physical review letters

Measurement of the Zgamma to nunugamma cross section and limits on  anomalous ZZgamma and Zgammagamma couplings in ppbar collisions at sqrt{s} =  1.96 TeV