The KM implementation of CP violation
The KM phase is like the Scarlet Pimpernel:Sometimes here, sometimes there,Sometimes everywhere!1
8.1 A bit of history
As described before, the discovery of CP violation had not been anticipated – it actually ran counter to rather firm expectations. Nevertheless, the experimental findings as well as their interpretation were soon accepted. The relevant phenomenology for strange decays was speedily developed, as described in the two preceding sections, and the community took on the challenge of designing dynamical models for CP and T violation.
A general classification of dynamical models was defined using a general decomposition of the Hamiltonian into CP even and odd parts: