N* resonances from K $\Lambda$ Λ amplitudes in sliced bins in energy
| Autor: | D. G. Ireland, Volker D. Burkert, Eberhard Klempt, J. Stahov, R. Omerović, V. A. Nikonov, Alfred Švarc, M. Hadžimehmedović, U. Thoma, A. V. Sarantsev, A. V. Anisovich |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics Hadron Quantum number 7. Clean energy 01 natural sciences Riemann hypothesis symbols.namesake Amplitude 0103 physical sciences symbols Invariant mass Nuclear Experiment 010306 general physics Nucleon Multipole expansion Energy (signal processing) Mathematical physics |
| Zdroj: | The European Physical Journal A. 53 |
| ISSN: | 1434-601X 1434-6001 |
| 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: | OpenAIRE |
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