Effects of additional isoscalar vector bosons in e+e- → fanti f processes at the TRISTAN and LEP energies

The phenomenological manifestation of the additional Y(YL) boson arising in the models with the composite structure of electroweak interactions is studied for the process e+e-→fanti f at the TRISTAN and LEP energies. It is shown that the presence of the additional isoscalar boson, which can provide the explanation of the experimentally observed deviation of Rμ value from the Standard Model predictions at TRISTAN, yields as measurable effect in the cross-section of e+e-→ μ+μ- (hadrons) processes at LEP. This effect in the muon and hadron cross-sections at the energies MZ±ΓZ/2 can be ∝1.5-2.0% for small values of the γ-Y mixing parameter. The increase of statistics for the above processes at TRISTAN and LEP will permit to set an additional limitation on the model parameters. (orig.)