Single intermediate vector boson production in e+e- collisions at √s = 183 and 189 GeV

The cross-sections for the production of single charged and neutral intermediate vector bosonswere measured using integrated luminosities of 52 pb^{-1} and 154 pb^{-1} collected by the DELPHIexperiment at centre-of-mass energies of 182.6 GeV and 188.6 GeV, respectively. The cross-sections for the reactions were determined in limited kinematic regions. The results found are in agreement with the Standard Model predictions for these channels.