Signals of the Abelian Z′ boson within the analysis of the LEP2 data

The preliminary LEP2 data on e+e− → l+l− scattering are analyzed to establish a model-independent search for the signals of virtual states of the Abelian Z′ boson. The recently introduced observables make it possible to pick up uniquely the Abelian Z′ signals in these processes. Themean values of the observables are in accordance with the Z′ existence. However, the accuracy of the experimental data is deficient to detect the signal at more than a 1σ C.L. The results of other model-independent fits and further prospects are discussed.