E₆ model manifestations in z and τ decays

Abstract

Possible manifestations of the E6 model in Z → ℓ⁺ℓ and in τ-decays are investigated. The differences between the Standard Model with four families and E₆ Model predictions are discussed. It is shown that the experimental study of spin asymmetry in the process e⁺e⁻ -> Z → τ⁺τ⁻ will give direct information on the lepton universality violation due to mixing between ordinary and exotic leptons predicted by E6 model, and that the investigation of the charged final lepton energy spectrum in τ-decays is an effective tool for establishing new physics predicted by E₆ model.