A test of the validity of the extraction ofK ? π? scattering in the reactionK ? p →K ?π?Δ++ in the framework of the one-pion-exchange model

In a study of the reactionK ^? p →K ^-π^?π⁺ p at 10 and 16 GeV/c the one-pion-exchange model was tested by attempting to extract on this basis the angular distributions for π⁺ p elastic scattering and comparing to real π⁺ p scattering. In thes-channel frame high order moments already appeared at relatively low mass. In general there are large discrepancies in both thes- andt-channel frames which remain after extrapolation to the pion pole and are related toQ ^? production. The structure of the decay angular distribution of theK ^? K ^- π^- system produced in association with Δ⁺⁺ is dominated by proton diffractive dissociation into Δ⁺⁺π^-.