Fine-tuning of the quasi-bound $K^{-}pp$ state

Characteristics of the quasi-bound state in the $K^{-}pp$ system strongly depend on the model of antikaon-nucleon interaction and weakly - on the nucleon-nucleon potential. In the present paper, dynamically exact Faddeev-type calculations with coupled $\bar{K}NN$ and $\pi \mathrm{\Sigma }N$ were performed using different models of the $\mathrm{\Sigma }N$ and $\pi N$ interactions to study the influence of these “less important” interaction on the three-body result. In addition, dynamically exact three-body Faddeev-type AGS calculations with three coupled particle channels $\bar{K}NN-\pi \mathrm{\Sigma }N-\pi \mathrm{\Lambda }N$ were performed.