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

Details 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 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

2009-02-12

arxiv.org/abs/0902.2157v1

Phys.Rev.Lett.102:201802,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevLett.102.201802

We present the first observation of the Zgamma to nunugamma process at the 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 ppbar Collider at sqrt{s} = 1.96 TeV. The measured Zgamma cross section multiplied 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 standard model prediction of 39 +- 4 fb. We set the most restrictive limits on anomalous trilinear Zgammagamma and ZZgamma gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.

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