Example of the Production of aπ−Meson by aK+Meson

Abstract

In 50 meters of 200-300 Mev ${K}^{+}$-meson track followed in nuclear emulsion, one interaction event has been found from which a pion track emerges. The incoming ${K}^{+}$ meson had a kinetic energy of 323\ifmmode\pm\else\textpm\fi{}20 Mev. The ${K}^{+}$ meson re-emerged with an energy of 30 Mev at 36 degrees. The pion track has a characteristic negative-pion ending, and the pion was emitted with 34 Mev at 96 degrees. In addition a 40-Mev proton left the star at 81 degrees and there are three other short tracks. Although the kinematics admit an analysis in which no inelastic secondary process occurred among the primary reaction products, strong inelastic secondary processes are quite possible and must be considered. Charge independence holds important implications for the pion yield charge ratios and the early trend of negative excess seems rather striking.