ON PARAMETRIZATION AND APPROXIMATION RELEVANT TO DESCRIBE VIOLATION OF CP-SYMMETRY, T-SYMMETRY AND CPT-SYMMETRY IN THE NEUTRAL KAON SYSTEM

We introduce several sets of parameters, which are rephasing-invariant and possess were defined properties, to describe violation of CP, T a nd CPT symmetries in the K-0-(K) over bar(0) system. It is pointed out that those parameters which signal T and CPT violations but not CP vi olation are not well constrained experimentally yet. We further introd uce a set of rephasing-dependent (= phase-convention-dependent) parame ters and investigate how they are related to our rephasing-invariant ( = phase-convention-independent) parameters. In this way, advantages an d disadvantages of and relations among various parametrizations are st ated clearly.