Measurement of the Z gamma -} nu(nu)over-bar gamma Production Cross Section and Limits on Anomalous ZZ gamma and Z gamma gamma Couplings in p(p)over-bar Collisions at root s=1.96 TeV (Art. No. 201802)
2009
Abstract
We present the first observation of the Z gamma -} nu(nu) over bar gamma process at the Fermilab Tevatron at 5.1 standard deviations significance, based on 3.6 fb(-1) of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p (p) over bar Collider at root s = 1.96 TeV. The measured Z gamma production cross section multiplied by the branching fraction of Z -} nu(nu) over bar is 32 /- 9(stat syst) /- 2(lumi) fb for the photon E-T } 90 GeV.
It is in agreement with the standard model prediction of 39 /- 4 fb. We set limits on anomalous trilinear Z gamma gamma and ZZ gamma gauge boson couplings, most of which are the most restrictive to date.