Short review of discrete symmetries studies in matter-antimatter systems

If the nature was utterly symmetric the matter would not exist. Yet, processes driven by gravitational, electromagnetic and strong interactions seem to be symmetric with respect to reflection in space (P), reversal in time (T) and charge conjugation (C). So far violations of these symmetries were observed only in processes governed by the weak interaction. Interestingly, though the matter which we know is made of quarks and leptons, violation of CP and T symmetries have been observed only for systems including quarks, and it has not yet been discovered in any processes involving purely leptonic matter. New techniques used for discrete symmetries studies in various systems consisting of matter and antimatter will be discussed together with a presentation of recent results. The gathered data of entangled kaons, B mesons or electron-positron systems allows to perform very precise test of the T, CP, and CPT discrete symmetries