\begin{document}$\bar{K}N$\end{document} interaction, \begin{document}$K^{-}pp$\end{document} system, quasi-bound state"> \begin{document}$\bar{K}NN-\pi\Sigma{N}$\end{document} system with quantum numbers I = 1/2 and S = 0 are solved. Using separable potentials for the \begin{document}$\bar{K}N-\pi\Sigma$\end{document} interaction, we calculate the transition probability for the \begin{document}$(Y_{K})_{I=0}+N\rightarrow\pi\Sigma{N}$\end{document} reaction. The possibility to observe the trace of the \begin{document}$K^{-}pp$\end{document} quasi-bound state in \begin{document}$\pi\Sigma{N}$\end{document} mass spectra was studied. Various types of chiral-based and phenomenological potentials are used to describe the \begin{document}$\bar{K}N-\pi\Sigma$\end{document} interaction. Finally, we show that we can observe the signature of the \begin{document}$K^{-}pp$\end{document} quasi-bound state in the mass spectra, as well as the trace of branch points in the observables."> Structure, formation, and decay of <inline-formula><tex-math id="M1">\begin{document}${{\bar{K}NN}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/3482d040-539a-4cf9-a719-5561d1e25ab9/CPC-2018-0309_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/3482d040-539a-4cf9-a719-5561d1e25ab9/CPC-2018-0309_M1.png"/></alternatives></inline-formula> system by Faddeev-AGS calculations -
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