Study of Z pair production and anomalous couplings in e+e- collisions at sqrt{s} between 190 GeV and 209 GeV.

A study of Z-boson pair prodn. in e+e- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states contg. only leptons, (l+l-l+l- and l+l-nn-), quark and lepton pairs, (qq-l+l-, qq-nn-) and only hadrons (qq-qq-)are considered. In all states with at least one Z boson decaying hadronically, lifetime, lepton and event-shape tags are used to sep. bb- pairs from qq- final states. Limits on anomalous ZZg 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. [on SciFinder (R)]