First of all, I'm not major in physics and the question might seems stupid, as I'm layman studying for my self-interest and I really don't know much about it. I only think it might open some understanding if I just start to ask some questions. So please correct me if I'm wrong.
If I understand it correctly, kaon has two decay pathways that give rise to different pions under complex transformation. This is considered as CP violation.
As I learned from Wikipedia, CPT symmetry appears that if a process violates CP symmetry, then it will violate T symmetry also. Thus, the kaon case also violates T symmetry, and this might happen to other particles other than kaon.
Now imagine a fictional "mirror" universe, where all the matters are antimatters and vice versa. Will the time arrow in this universe in the opposite direction with the time arrow in our universe? How can we tell that?
Please correct me if I'm wrong and give me some explanations regarding this problems in layman terms, and also some formal formulations, if any, so I can relate the formal materials and the layman analogy. Thanks!