Phenomenological implications of the topflavour model

We explore phenomenologies of the topflavour model for the LEP experiment at mZ scale and the atomic parity violation (APV) experiment in the Cs atoms at low energies. Implications of the model on the Z peak data are studied in terms of the precision variables ϵiʹs. We find that the LEP data give more stringent constraints on the model parameters than the APV data.