Z production in e + e interactions at p s = 183 209 GeV PRELIMINARY

Measurements of Z production are described using the data sample collected by the DELPHI detector at centre-of-mass energies ranging from 183 to 209 GeV, corresponding to an integrated luminosity of about 667 pb 1 . The measurements cover a wide range of the possible nal state four-fermion congurations: hadronic and leptonic (e + e q q, + q q, q q ), fully leptonic (l + l l 0+ l 0 ) (for which also a total cross-section measurement is performed) and fully hadronic nal states (q qq q, with a low mass q q pair). Measurements of the Z cross-section for the various nal states have been compared with the Standard Model expectations and found to be consistent within the errors.