More on Parametrization Relevant to Describe Violation of CP, T and CPT Symmetries in the $K^0-\overline{K^0}$ System

Abstract

To study violation of CP, T and/or CPT symmetries in the $K^0-\overline{K^0}$ systems, one has to parametrize the relevant mixing parameters and decay amplitudes in such a way that each parameter represents violation of these symmetries in a well-defined way. Parametrization is of course not unique and is always subject to phase ambiguities. We discuss these problems with freedom associated with rephasing of final (or intermediate) as well as initial states taken into account. We present a fully rephasing-invariant parametrization and a particular rephasing-dependent parametrization, and give a couple of comments related to these and other possible parametrizations.