Single resonant neutral vector boson production at LEP2

Preliminary measurement of the cross-section for the single resonant production of neutral intermediate vector boson \Zee is presented using the data collected at the centre-of-mass energies $\sqrt{s}=$183,189,192,196, 200,202,205 and 207 GeV by the \Aleph experiment. The analysis is performed in the leptonic channel \Zmm. The result found for the cross-section of the process in this dimuon final state, $\sigma = 0.057 \pm 0.015$ pb, agrees with the Standard Model predictions.