EXPERIMENTAL CONSTRAINTS TO REPHASING-INVARIANT CP, T AND CPT VIOLATING PARAMETERS IN THE NEUTRAL KAON SYSTEM

A phenomenological and comprehensive study is given of the (possible) violation of CP, T and CPT symmetries in the K-0-<(K)over bar (0)> sys tem. Relevant decay amplitudes as well as mixing parameters are parame trized in a rephasing-invariant way, and formulae relevant to phenomen ological analyses are derived, An attempt is made to derive constraint s on these CP, T and/or CPT violating parameters from available experi mental data. It is found, among other things, that the parameters whic h signal both CP and CPT violations are subject to large errors and at best only one or two orders smaller than those which signal both CP a nd ir violations, the latter being known to be of order 10(-3). Furthe rmore, it is pointed out that those parameters which signal both T and CPT violations but not CP violation are not yet well constrained expe rimentally.