Zγ production and limits on anomalous ZZγ and Zγγ couplings in [formula omitted] collisions at [formula omitted

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doi:10.1016/j.physletb.2007.08.035

Abstract

We present a study of eeγ and μμγ events using 1109 (1009) pb−1 of data in the electron (muon) channel, respectively. These data were collected with the DØ detector at the Fermilab Tevatron pp¯ collider at s=1.96 TeV. Having observed 453 (515) candidates in the eeγ (μμγ) final state, we measure the Zγ production cross section for a photon with transverse energy ET>7 GeV, separation between the photon and leptons ΔRℓγ>0.7, and invariant mass of the di-lepton pair Mℓℓ>30 GeV/c2, to be 4.96±0.30(stat.+syst.)±0.30(lumi.) pb, in agreement with the Standard Model prediction of 4.74±0.22 pb. This is the most precise Zγ cross section measurement at a hadron collider. We set limits on anomalous trilinear Zγγ and ZZγ gauge boson couplings of −0.085<h30γ<0.084, −0.0053<h40γ<0.0054 and −0.083<h30Z<0.082, −0.0053<h40Z<0.0054 at the 95% C.L. for the form-factor scale Λ=1.2 TeV.

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