Zγ production and limits on anomalous ZZγ and Zγγ couplings in pp‾ collisions at √s=1.96 TeV

Abazov, V. M. ; Mondal, N. K. ; et., al (2007) Zγ production and limits on anomalous ZZγ and Zγγ couplings in pp‾ collisions at √s=1.96 TeV Physics Letters B, 653 (5-6). pp. 378-386. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/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< hγ30< 0.084,-0.0053< hγ40< 0.0054 and - 0.083 < hZ30 <0.082, -0.0053 < hZ40 < 0.0054 at the 95% C.L. for the form-factor scale Λ=1.2 TeV.

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