p¯−pAnnihilations toKandπMesons at 2.7 GeV/c

Abstract

We report results on the reactions $\overline{p}+p\to K+\overline{K}+n\pi$ ($n=1, 2, \cdots$) at 2.7 GeV/c. The cross section for this process is estimated to be 4.1±0.6 mb. Comparison of 2.7-GeV/c partial cross sections with data at 3.0 and 3.7 GeV/c indicates that these partial cross sections either are relatively constant or slowly decrease with energy. $K^{*}\mathrm{}\left(890\right)\mathrm{}$ production is observed in all the four-, five-, and six-body final states. The production of ${\rho }^0$ and ${\omega }^0$ is also observed. The $K\overline{K}$ mass spectra show enhancements near threshold as has been seen in other $\overline{p}-p$ experiments. The present data cannot distinguish between a resonance or $S$-wave scattering-length interpretation of these enhancements. No significant evidence for resonances decaying into $K\pi \pi$ or $K\overline{K}\pi$ was observed.