Study of the ZZγ and Zγγ Couplings in Z()γ Production
Abstract
We have measured the ZZ-gamma and Z-gamma-gamma couplings by studying p-bar p -> (missing ET) gamma + X events at sqrt(s)=1.8 TeV with the D0 detector at the Fermilab Tevatron Collider. This first study of hadronic Z-gamma production in the neutrino decay channel gives the most stringent limits on anomalous couplings available. A fit to the transverse energy spectrum of the photon in the candidate event sample, based on a data set corresponding to an integrated luminosity of 13.1 pb(-1), yields 95% CL limits on the anomalous CP-conserving ZZ-gamma couplings of |hZ(30)|<0.9, |hZ(40)|<0.21, for a form-factor scale Lambda = 500 GeV. Combining these results with our previous measurement using Z -> ee and mu-mu yields the limits:|hZ(30)|<0.8, |hZ(40)|<0.19 (Lambda = 500 GeV) and |hZ(30)|<0.4, |hZ(40)|<0.06 (Lambda = 750 GeV).
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