Does K_L-K_S mass difference constraints or \\ claims new physics beyond the Standard Model?

The ratio $\Delta m_K/m_K$ within the standard model with 3 generations is calculated as a function of the CP nonconserving phase $\delta_{13}$ and the quark masses $m_c,m_t$ assuming the current values of the Cabibbo-Kobayashi-Maskawa mixing angles. We have found that varying $\delta_{13}$ and $m_c$ within the allowed range, not all the values for the top quark mass fit the experimental value for that ratio.