Resonant Two-BodyDDecays

The contribution of a $K^{*}\left(1430\right)$ $0^{+}$ resonance to $D^0\to K^{-}{\pi }^{+}$ is calculated by applying the soft pion theorem to $D^{+}\to K^{*}{\pi }^{+}$, and is found to be about $30\%$ of the measured amplitude and to be larger than the $\Delta I=3\mathrm{}/2$ component of this amplitude. We estimate a $70\%$ contribution to the total amplitude from a higher $K^{*}\left(1950\right)$ resonance. This implies large deviations from factorization in $D$ decay amplitudes, a lifetime difference between $D^0$ and $D^{+}$, and an enhancement of $D^0–{\overline{D}}^0$ mixing due to SU(3) breaking.