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

Abstract

We investigate double-strangeness exchange reactions, K-p & RARR; K+E.3- and K-p & RARR; K0E0, using an effective Lagrangian approach based on a hybrid Regge-plus-resonance model involving rescattering diagrams. We consider the background processes that include A, E, and & sigma;(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 A(2100, 7/2-) and E(2030, 7/2+) resonances contribute significantly, and the & sigma;(2250) resonance favors JP = 7/2-. The interference pattern between the A(2100, 7/2-) and E(2030, 7/2+) amplitudes is essential for describing forward differential cross sections in the resonance region 2.07 < & RADIC;s < 2.15 GeV. The absence of the S = -2 meson leads to the inclusion of the meson-baryon rescattering diagrams to describe the K-p & RARR; KE reaction data, proving the significant contribution of the (p, p, w)-(A, E) rescattering diagrams.