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arXiv · 2509.18920

Fine-tuning of the $\bar{K}NN$ and $\bar{K}\bar{K}N$ quasi-bound state calculations

N. V. Shevchenko
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Abstract

Fine-tuning of the binding energies and widths of the quasi-bound states in three-body systems consisting of antikaon(s) and nucleon(s) was performed. Dynamically exact three-body Faddeev-type AGS equations with three coupled particle channels were solved for the description of the $\bar{K}NN$ and $\bar{K} \bar{K} N$ systems in different spin states. New models of the antikaon-nucleon and pion-nucleon interactions were constructed, and together with our best versions for the remaining potentials were used as input. The characteristics of the quasi-bound $K^- pp$ state calculated with our new one-pole $\bar{K}N - \pi \Sigma - \pi \Lambda$ potential reproduces the experimental data from the E15 J-PARC experiment.

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N. V. Shevchenko. 2025-09-23. Fine-tuning of the $\bar{K}NN$ and $\bar{K}\bar{K}N$ quasi-bound state calculations. https://arxiv.org/abs/2509.18920

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