CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA
According to the principle of minimality, we find a new SU(6) model. This SU(6) model, and other models, can be identified as a theoretical origin of an extra Z0 boson. We apply the strategy of Boudjema et al. (BLRV) which is very effective in identifying the theoretical origin of an extra Z0 boson in the new SU(6) model, and compare the model with six other models.