Measurement of the $ZZγ$ and $Zγγ$ Couplings in $p\bar p$ Collisions at $\sqrt{s} = 1.8$ TeV

Details Measurement of the $ZZγ$ and $Zγγ$ Couplings in $p\bar p$ Collisions at $\sqrt{s} = 1.8$ TeV Measurement of the $ZZγ$ and $Zγγ$ Couplings in $p\bar p$ Collisions at $\sqrt{s} = 1.8$ TeV

1995-03-13

arxiv.org/abs/hep-ex/9503010v1

Phys.Rev.Lett.75:1028,1995

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 1 table, and 3 figures

Scientific paper

10.1103/PhysRevLett.75.1028

We have directly measured the ZZ-gamma and Z-gamma-gamma couplings by studying p pbar --> l+ l- gamma + X, (l = e, mu) events at the CM energy of 1.8$ TeV with the D0 detector at the Fermilab Tevatron Collider. A fit to the transverse energy spectrum of the photon in the signal events, based on the data set corresponding to an integrated luminosity of 13.9 pb^-1 ($13.3 pb^-1) for the electron (muon) channel, yields the following 95% confidence level limits on the anomalous CP-conserving ZZ-gamma couplings: -1.9 < h^Z_30 < 1.8 (h^Z_40 = 0), and -0.5 < h^Z_40 < 0.5 (h^Z_30 = 0), for a form-factor scale Lambda = 500 GeV. Limits for the Z-gamma-gamma$ couplings and CP-violating couplings are also discussed.

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