A study of Z-boson pair production in e+e- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states containing only leptons, (ℓ+ℓ -ℓ+ℓ- and ℓ+ℓ -νν̄), quark and lepton pairs, (qq̄ℓ +ℓ-, qq̄νν̄) and only hadrons (qq̄qq̄) are considered. In all states with at least one Z boson decaying hadronically, lifetime, lepton and event-shape tags are used to separate bb̄ pairs from qq̄ final states. Limits on anomalous ZZγ and ZZZ couplings are derived from the measured cross sections and from event kinematics using an optimal observable method. Limits on low scale gravity with large extra dimensions are derived from the cross sections and their dependence on polar angle.
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)