Double-strangeness exchange reactions in a hybrid Regge-plus-resonance approach

We investigate double-strangeness exchange reactions, K-p→K+Ξ- and K-p→K0Ξ0, using an effective Lagrangian approach based on a hybrid Regge-plus-resonance model involving rescattering diagrams. We consider the background processes that include Λ, ς, and ς(1385) Regge trajectories in the u channel and the s-channel Born-term diagrams. The s-channel hyperon resonances account for the bump structures in the total cross sections. The s-channel Λ(2100,7/2-) and ς(2030,7/2+) resonances contribute significantly, and the ς(2250) resonance favors JP=7/2-. The interference pattern between the Λ(2100,7/2-) and ς(2030,7/2+) amplitudes is essential for describing forward differential cross sections in the resonance region 2.07<s<2.15GeV. The absence of the S=-2 meson leads to the inclusion of the meson-baryon rescattering diagrams to describe the K-p→KΞ reaction data, proving the significant contribution of the (φ,ρ,ω)-(Λ,ς) rescattering diagrams.