# Z$\gamma$ production and limits on anomalous ZZ$\gamma$ and Z$\gamma\gamma$ couplings in p$\bar p$ collisions at $\sqrt{s}$ = 1.96 TeV

Abstract : We present a study of eegamma and mumugamma events using over 1 fb-1 of data collected with the D0 detector at the Fermilab Tevatron ppbar Collider at sqrt(s) = 1.96 TeV. Having observed 453 (515) candidates in the eegamma (mumugamma) final state, we measure the Zgamma production cross section for a photon with transverse energy ET > 7 GeV, separation between the photon and leptons Delta R(lgamma} > 0.7, and invariant mass of the di-lepton pair M(ll) > 30 GeV, 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 Zgamma cross section measurement at a hadron collider. We set limits on anomalous trilinear Zgammagamma and ZZgamma gauge boson couplings of -0.085 < h(30)^(gamma) < 0.084, -0.0053 < h(40)^(gamma) < 0.0054 and -0.083 < h(30)^(Z) < 0.082, -0.0053 < h(40)^(Z) < 0.0054 at the 95% C.L. for the form-factor scale Lambda = 1.2 TeV.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00146504
Contributor : Lpsc Bibliotheque <>
Submitted on : Tuesday, May 15, 2007 - 9:42:11 AM
Last modification on : Tuesday, May 4, 2021 - 11:26:08 AM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Z$\gamma$ production and limits on anomalous ZZ$\gamma$ and Z$\gamma\gamma$ couplings in p$\bar p$ collisions at $\sqrt{s}$ = 1.96 TeV. Physics Letters B, Elsevier, 2007, 653, pp.378-386. ⟨10.1016/j.physletb.2007.08.035⟩. ⟨in2p3-00146504⟩

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