Bounds on the Z' mass and mixing angles in the ununified gauge models

Abstract

We calculate the total cross sections and forward-backward asymmetries in e⁺e⁻→ff⁻ processes with all possible leptonic and hadronic channels in the ununified models for a wide range of center-of-mass energy and then compare our results with those calculated in the standard model, taking into consideration the Z-Z' mixing in the ununified models. We show that both ununified models cannot be distinguished from the standard model through the measurement of the above parameters. Interestingly, the mixing angles of these ununified models are severely constrained from the measured CERN LEP data, which ultimately leads to a Z' mass of more than 1 TeV.