Topics on fundamental symmetries in particle physics

Topics on the test of fundamental symmetries are shown. Comparison of the gravitational interactions between particle and anti-particle is one of the most important experiments for the test of the CPT-theorem. The measurement of K _L ⁰ →π⁰e^{+ -} is being carried out in order to find the direct CP-violating amplitude. Several experiments to search for the T-violation are being carried out. The muon polarization in K⁺→π⁰μ⁺υdecay and the electron polarization in the β-decay of polarized⁸Li are very interesting from the viewpoint of T-violation. Recent progress of the measurement of electric dipole moments of atoms and the neutron are mentioned. Studies of parity-violating processes in nucleon-nucleon scattering and nucleon-nucleus reactions are discussed. The results encourage us to measure the T-violation using polarized neutrons and a polarized nuclear target.