Eur. Phys. J. A (2013) 49: 44
https://doi.org/10.1140/epja/i2013-13044-5

Regular Article - Theoretical Physics

Coupled-channel dynamics in the reactions πN → πN, ηN, KΛ, KΣ

¹⁹⁸⁷³ Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
²⁹⁸⁷³ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
³⁹⁸⁷³ Department of Physics and Astronomy, University of Georgia, 30602, Athens, Georgia, USA
⁴⁹⁸⁷³ Institute for Nuclear Studies and Department of Physics, The George Washington University, 20052, Washington, DC, USA
⁵⁹⁸⁷³ Institute for Advanced Simulation, D-52425, Jülich, Germany

^* e-mail: d.roenchen@fz-juelich.de

Received: 20 December 2012
Accepted: 11 March 2013
Published online: 12 April 2013

Abstract

Elastic πN scattering and the world data of the family of reactions π ⁻ p → ηn, K ⁰ Λ, K ⁰ Σ ⁰, K ⁺ Σ ⁻, and π ⁺ p → K ⁺ Σ ⁺ are described simultaneously in an analytic, unitary, coupled-channel approach. SU(3) flavor symmetry is used to relate both the t - and the u - channel exchanges that drive the meson-baryon interaction in the different channels. Angular distributions, polarizations, and spin-rotation parameters are compared with available experimental data. Partial-wave amplitudes are determined and the resonance content is extracted from the analytic continuation, including resonance positions and branching ratios, and possible sources of uncertainties are discussed. The results provide the final-state interactions for the ongoing analysis of photo- and electroproduction data.