Interference phenomena in the decay $D^+_s\to\eta\pi^0\pi^+$ induced by the $a^0_0(980)-f_0(980)$ mixing

  title={Interference phenomena in the decay \$D^+\_s\to\eta\pi^0\pi^+\$ induced by the \$a^0\_0(980)-f\_0(980)\$ mixing},
  author={Nikolai N. Achasov and G. N. Shestakov},
Using the data on the decay $D^+_s\to f_0(980)\pi^+\to K^+K^-\pi^+$, we estimate the amplitude of the process $D^+_s\to\left[f_0(980)\to (K^+K^-+K^0\bar K^0)\to a^0_0(980)\right]\pi^+\to\eta\pi^0\pi^+$, caused by the mixing of $a^0_0(980)$ and $f_0(980)$ resonances that breaks the isotopic invariance due to the $K^+$ and $K^0$ meson mass difference. Effects of the interference of this amplitude with the amplitudes of the main mechanisms responsible for the decay $D^+_s \to\eta \pi^0\pi^+$ are… 
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