Comparative Analysis of the Model-Independent Constraints on Contact Interactions from LEP2 Data

Abstract

Comparative analysis of the nowdays model-independent searches for virtual states of new heavy particles at LEP2 experiment energies is presented. Three approaches developed are discussed and applied in order to find the signals of the heavy Z' gauge boson in the annihilation processes e+e- —μ+μ-,r+r-. It is shown that the experimental data are in correspondence with existence of this particle.