Problem of oscillations presence at $CP$ violation in the system of   $K^o$ mesons
  In this work there are considered two approaches to the description of $K^o, \bar K^o$ meson transitions into $K_S (K^o_1)$ mesons at $CP$ violation in weak interactions. The first approach uses the standard theory of oscillations and the second approach supposes that ($K_S, K_L$) states which arise at $CP$ violation are normalized but not orthogonal state functions then there arise interferences between these states but not oscillations. It is necessary to remark that the available experimental data are in good agreement with the second approach. So we came to the conclusion that oscillations do not arise at $CP$ violation in weak interactions in the system of $K^o$ mesons. Only interference between two - $K_S, K_L$ states takes place there. 
Kh. M. Beshtoev
hep-ph