Symmetries in particle physics

Discrete symmetries:
CP violation
Mixing in the system of the neutral mesons (cont'd)
ε is related to the Hamiltonian of the kaon system:
The off-diagonal elements are given by amplitudes
for the transition between the two kaons:
The amplitude is proportional to a product of four
CKM matrix elements of the form
This allows for complex values in the Hamiltonian
matrix CP violation.