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arXiv · 1712.07537

$N^*$ resonances from $K\Lambda$ amplitudes in sliced bins in energy

A. V. Anisovich·V. Burkert·M. Hadžimehmedović·D. G. Ireland·E. Klempt·V. A. Nikonov·R. Omerović·A. V. Sarantsev·J. Stahov·A. Švarc·U. Thoma
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Abstract

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 $J^P = 1/2^+$, $3/2^+, 1/2^-, 3/2^-, 5/2^-$.

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A. V. Anisovich, V. Burkert, M. Hadžimehmedović, D. G. Ireland, E. Klempt, V. A. Nikonov, R. Omerović, A. V. Sarantsev, J. Stahov, A. Švarc, U. Thoma. 2017-12-20. $N^*$ resonances from $K\Lambda$ amplitudes in sliced bins in energy. https://doi.org/10.1140/epja/i2017-12443-x

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