Double-charge-exchange reactions and Regge-Regge cuts in a dual Regge model

A model which previously achieved a good quantitative description of 19 different 0⁻ 1/2⁺ → 0⁻ 1/2⁺ reactions is extended to double-charge-exchange reactions. The underlying mechanism is double Regge exchange, calculated in an SU(3)-symmetric dual absorptive model. The results depend on whether a nonet or an octet of mesons is assumed in the intermediate state; strong theoretical reasons for favoring a nonet are given. The amplitudes obtained in the previous model produce good quantitative agreement with recent data on π⁻p→K⁺Σ⁻, K⁻p→π⁺Σ⁻, and $K^{-}p\to K^{+}{\Xi }^{-}$ forward differential cross sections.