  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.

High Energy Physics - Phenomenology