A Study of Diffraction-ProducedK*πandΔπSystems in 12.6-GeV/cK−pInteractions

Abstract

Two different peripheral quasi three-body final-state processes are studied in the reaction $K^{-}p\to K^{-}p{\pi }^{+}{\pi }^{-}$ Near-threshold mass enhancements are observed in both the ${\overline{K}}^{*0\mathrm{}}\mathrm{}\left(890\right)\mathrm{}{\pi }^{-}$ and ${\Delta }^{++}\mathrm{}\left(1238\right)\mathrm{}{\pi }^{-}$ systems. In both cases the data are suggestive of a production mechanism involving inelastic diffraction scattering. For each case a comparison is made with the predictions of a double-Regge-pole exchange model.