The present status of rare decays of mesons and leptons are reviewed in terms of CP violation and lepton avor violation. Neutrinoless double beta decays are also discussed in terms of lepton number violation.

In the electroweak sector of Standard Model, CP violation arises through a very particular interplay between three quark generations, as described by Cabibbo--Kobayashi--Maskawa (CKM) mechanism and single Jarlskog invariant $J_4$. Once generalized to Model Effective Field Theory (SMEFT), this peculiar pattern gets modified higher-dimensional operators, whose associated Wilson coefficients are u...

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