2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48100Recently a rephasing invariant definition of the CP-mixing parameter for Indirect CP Violation has been introduced. This is made possible by the explicit use of the CP operator into the analysis. The problem is then that of the determination of the CP operator for a CP violating scenario. We discuss it and provide a definite solution.7 pages, 1 figure, Lecture presented at "Loops and Legs in Gauge Theories", Rheinsberg, April 1998High Energy Physics - Phenomenologytext