Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV

Abstract

Measurements of on-shell ZZ production are described, using data collected by DELPHI in 1997 and 1998, at centre-of-mass energies sqrt(s) = 182.6 GeV and 188.6 GeV respectively. Results obtained in each of the final states q qbar q qbar, mu+mu- q qbar, e+e- q qbar, nu nubar q qbar, l+l-l+l-, and nu nubar l+l- are presented. The measured cross-sections for on-shell ZZ production via the tree-level doubly-resonant graphs (NC02) are: sigma_{NC02}(182.6 GeV) = 0.38 +- 0.18 (stat) +- 0.04 (syst) pb, sigma_{NC02}(188.6 GeV) = 0.60 +- 0.13 (stat) +- 0.07 (syst) pb. They are consistent with the Standard Model expectations of 0.25 pb and 0.65 pb at each energy.

18 pages, 5 figures

References in corpus (6)

• Limits on Low Scale Gravity from $e^{+}{e}^{-}\to W^{+}{W}^{-},ZZ$ and $\gamma \gamma$
• Measurement of the e+e- -> ZZ production cross-section at centre-of-mass energies of 183 and 189GeV
• The Monte Carlo Program KORALZ, for the Lepton or Quark Pair Production at LEP/SLC Energies -- From version 4.0 to version 4.04
• Study of Z Boson Pair Production in e+e- Collisions at LEP at \sqrt{s}=189 GeV
• Z boson pair production in e+e- collisions at sqrt(s) = 183 and 189 GeV
• Report of the QCD Working Group

Cited by in corpus (5)

• Study of Z Pair Production and Anomalous Couplings in e+e- Collisions at sqrt(s) between 190 GeV and 209 GeV
• ZZ production in e+e- interactions at sqrt(s) = 183 - 209 GeV
• Z Boson Pair-Production at LEP
• Finite-width effects in the near-threshold ZZZ and ZWW production at ILC
• Measurement of Neutral-Current Four-Fermion Production at LEP2