Light baryon resonances from a coupled-channel study including $$\mathbf {K\Sigma }$$ photoproduction

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 58; no. 11
• Main Authors: Rönchen, D., Döring, M., Meißner, U.-G., Shen, C.-W.
• Format: Journal Article
• Language: English
• Published: United States Springer Nature 27.11.2022
• Subjects: NUCLEAR PHYSICS AND RADIATION PHYSICS
• DOI: 10.1140/epja/s10050-022-00852-1
• ISSN: 1434-601X

Abstract The Jülich-Bonn dynamical coupled-channel approach is extended to include $$K\Sigma $$ K Σ photoproduction off the proton. Differential cross section and (double) polarization data for $$K^+\Sigma ^0$$ K + Σ 0 and $$K^0\Sigma ^+$$ K 0 Σ + are analysed simultaneously with the pion- and photon-induced production of $$\pi N$$ π N , $$\eta N$$ η N , $$K\Lambda $$ K Λ , and $$K\Sigma $$ K Σ final states, totaling almost 72,000 data points for center-of-mass energies $$W<2.4$$ W < 2.4  GeV. Based on the fit results the spectrum of $$N^*$$ N ∗ and $$\Delta $$ Δ resonances is extracted in terms of pole positions and residues. We discuss the impact of the $$\gamma p\rightarrow K\Sigma $$ γ p → K Σ channels in detail and investigate the influence of recent polarization data for $$\eta p$$ η p photoproduction.