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Phys. Rev. Lett. 102, 201802 (2009) [7 pages]

Measurement of the Zγνν̅ γ Production Cross Section and Limits on Anomalous ZZγ and Zγγ Couplings in pp̅ Collisions at s=1.96  TeV

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V. M. Abazov et al. D0 Collaboration
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Received 12 February 2009; published 22 May 2009

We present the first observation of the Zγνν̅ γ 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 pp̅ Collider at s=1.96  TeV. The measured Zγ production cross section multiplied by the branching fraction of Zνν̅ is 32±9(stat+syst)±2(lumi)  fb for the photon ET>90  GeV. It is in agreement with the standard model prediction of 39±4  fb. We set limits on anomalous trilinear Zγγ and ZZγ gauge boson couplings, most of which are the most restrictive to date.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.201802
DOI:
10.1103/PhysRevLett.102.201802
PACS:
12.15.Ji, 12.60.Cn, 13.38.Dg, 13.40.Em