Paper published in The European Physical Journal A - Published 22 December 2017
N* resonances from K ΛΛ 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
The two reactions $\gamma p \rightarrow K^{+} \Lambda$ and $\pi^{-}p \rightarrow K^{0}\Lambda$ 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 $J^P=1/2+,3/2+,1/2−,3/2−,5/2−$ .
