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Measurement of the ZZγZ Z \gamma and ZγγZ \gamma \gamma couplings in ppˉp\bar{p} collisions at s=1.8\sqrt{s} = 1.8 TeV

Collaboration
Mar, 1995
16 pages
Published in:
  • Phys.Rev.Lett. 75 (1995) 1028
e-Print:
DOI:
Report number:
  • FERMILAB-PUB-95-042-E
Experiments:
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Abstract:
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 1.8TeVwiththeD0detectorattheFermilabTevatronCollider.Afittothetransverseenergyspectrumofthephotoninthesignalevents,basedonthedatasetcorrespondingtoanintegratedluminosityof13.9pb −1(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.
Note:
  • 11 pages, 1 table, and 3 figures. Report-no: Fermilab-Pub-95-042-E, submitted to PRL
  • D0
  • anti-p p: colliding beams
  • colliding beams: anti-p p
  • anti-p p: inclusive reaction
  • Z0: hadroproduction
  • hadroproduction: Z0
  • coupling: (Z0 2photon)
  • (Z0 2photon): coupling
  • coupling: (2Z0 photon)
  • (2Z0 photon): coupling