The question we want to analyze is described by Branco, Lavoura and Silva:
There is no other particle with equal mass. Therefore, KL must
be its own antiparticle. It decays both to Pi+e−Nue and to the C-conjugate
mode Pi−e+Nue. However, it decays slightly less often
to the first than to the second mode. This fact unequivocally
establishes both C violation and CP violation.
There is an unstated assumption in their statement: the decays of the kaon are
internal (independent of the background) and acausal (they have no cause). These
assumptions come from standard quantum mechanics.
We show that there is a cause for their decay and there is neither C violation
nor CP violation in the decays of the kaon. The asymmetry in the decays is due to
the asymmetry of the background, not an inherent difference.