π+−pInteractions ProducingΣ+−K+in a Propane Bubble Chamber

Abstract

Seven cases of production of ${\ensuremath{\Sigma}}^{+}\ensuremath{-}{K}^{+}$ by 1.0-Bev ${\ensuremath{\pi}}^{+}\ensuremath{-}p$ interactions have been identified in the Yale propane bubble chamber. In six of these cases, the ${\ensuremath{\Sigma}}^{+}$ direction was forward in the center-of-momentum system. The cross section derived from these is 0.08 mb. The decay of the ${\ensuremath{\Sigma}}^{+}$ is equally divided between the pion and proton decay modes.