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

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2001) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 497, p. 199-213 (2001)

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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.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2001). Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 497, 199-213. https://doi.org/10.1016/S0370-2693(00)01346-0 (Original work published 2001)