Crossing and duality consistent study of Λ,Σ0, and Λ(1405) production by kaon photoproduction and radiative capture

We report a comprehensive analysis of the crossing related reactions p(γ,${\mathit{K}}^{+}$)Y and p(${\mathit{K}}^{\mathrm{-}}$,γ)Y for Y=Λ, ${\mathrm{\Sigma }}^0$, and Λ(1405). Our model, which incorporates both crossing and duality, reproduces all existing Λ and ${\mathrm{\Sigma }}^0$ cross-section, polarization, and capture branching-ratio data while providing useful constraints for the Λ(1405) magnetic transition moments. While the p(γ,${\mathit{K}}^{+}$)Λ(1405) cross section is predicted to be measurable at CEBAF (σ∼1 μb), parity conservation leads to a model-independent suppression of the p(γ,${\mathit{K}}^{+}$)Λ→(1405) polarization and p(${\mathit{K}}^{\mathrm{-}}$,γ)Λ(1405) cross section (σ∼1 nb).