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

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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<2.150.16em0exGeV. 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.