$N^*$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
| Autor: | Anisovich, A. V., Burkert, V., Hadžimehmedović, M., Ireland, D. G., Klempt, E., Nikonov, V. A., Omerović, R., Sarantsev, A. V., Stahov, J., Švarc, A., Thoma, U. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epja/i2017-12443-x |
| Popis: | The two reactions $\gamma p\to K^+\Lambda$ and $\pi^-p\to K^0\Lambda$ are analyzed to determine the leading photoproduction multipoles and the pion-induced partial wave amplitudes in slices of the invariant mass. The multipoles and the partial-wave amplitudes are simultaneously fitted in a multichannel Laurent+Pietarinen model (L+P model), which determines the poles in the complex energy plane on the second Riemann sheet close to the physical axes. The results from the L+P fit are compared with the results of an energy-dependent fit based on the Bonn-Gatchina (BnGa) approach. The study confirms the existence of several poles due to nucleon resonances in the region at about 1.9\,GeV with quantum numbers $J^P = 1/2^+$, $3/2^+, 1/2^-, 3/2^-, 5/2^-$. Comment: 18 pages, 12 figures |
| Databáze: | arXiv |
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