Strange-Particle Production by1.7−GeVcπ+on Protons

The Princeton-Pennsylvania accelerator 15-in. hydrogen bubble chamber was used to investigate ${\pi }^{+}p$ associated production at 1.7 $\frac{\mathrm{GeV}}{c}$. Approximately 4000 events were found; about half of these were in the ${\Sigma }^{+}{K}^{+}$ channel. The $\Lambda K^{+}{\pi }^{+}$ channel dominates the remaining half of the data. We find evidence for the existence of a $T=1\mathrm{}$ hyperon resonance at 1475±15 MeV with a width of 30±15 MeV in the $\Lambda K^{+}{\pi }^{+}$, ${\Sigma }^{+}{K}^{+}{\pi }^0$, ${\Sigma }^0{K}^{+}{\pi }^{+}$, and $P{K}^{+}{\overline{K}}^0$ channels. The cross sections of the strange-particle channels and the branching ratios of various resonances are also presented.