Abstract
A phenomenological study is given of the (possible) violation of CP and CPT symmetries in the A'- K system. Special attention is paid to the problem of phase ambiguity and phase convention. Mixing parameters and decay amplitudes are parametrized in a rephasing invariant way, and the well-known parameters 7'/+- and 7'/oo describing 2Jr modes as well as various leptonic asymmetries are expressed in terms of these parameters. The parameters E and L1 characterizing mixing between IK> and IK 0 ) are treated with as little theoretical prejudice as possible.
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