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