$N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy

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

arXiv comment18 pages, 12 figures

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Cited by in corpus (14)

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