Calculations of $K^-$ nuclear quasi-bound states based on chiral meson-baryon amplitudes
| Autor: | Gazda, D., Mares, J. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Nucl. Phys. A 881 (2012) 159 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.nuclphysa.2012.01.016 |
| Popis: | In-medium ${\bar K}N$ scattering amplitudes developed within a new chirally motivated coupled-channel model due to Cieply and Smejkal that fits the recent SIDDHARTA kaonic hydrogen 1s level shift and width are used to construct $K^-$ nuclear potentials for calculations of $K^-$ nuclear quasi-bound states. The strong energy and density dependence of scattering amplitudes at and near threshold leads to $K^-$ potential depths $-Re V_K \approx 80 -120$ MeV. Self-consistent calculations of all $K^-$ nuclear quasi-bound states, including excited states, are reported. Model dependence, polarization effects, the role of p-wave interactions, and two-nucleon $K^-NN\rightarrow YN$ absorption modes are discussed. The $K^-$ absorption widths $\Gamma_K$ are comparable or even larger than the corresponding binding energies $B_K$ for all $K^-$ nuclear quasi-bound states, exceeding considerably the level spacing. This discourages search for $K^-$ nuclear quasi-bound states in any but lightest nuclear systems. Comment: 12 pages, 11 figures |
| Databáze: | arXiv |
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