ELECTRO-WEAK UNIFIED TNEQRY AND RELATED PROBLEMS

The minimum SU(2)×U(1) electro-weak unified theory is described and several related problems including the connection between anomaly free and charge quantization, Kobayashi-Maskawa mixing and CP violation and Higgs sector are dis-cussed. The experimental verification minimum of SU(2)×U(1) model in low energy range is presented briefly. Physical conseguences concerning to free W and Z particles are discussed. The possibilities of the existence or gauge symmetry higher than SU(2)×U(1) for electro-weak interaction and with the minimum SU(2)×U(1) model as the first order of approximation in the low energy range are given. New phenomena involving Z Partice and their implication based on SU(2)×U(1) model are examined.