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

Abstract

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