BackwardK−−pScattering at 1-2GeVcand Resonant-StateY*'s

Abstract

Backward $K^{-}-p$ scattering at 1-2 $\frac{\mathrm{GeV}}{c}$ is described in terms of the resonance amplitudes due to the ${Y_1}^{*}\mathrm{}\left(1765\right)\mathrm{}$, ${Y_0}^{*}\mathrm{}\left(1815\right)\mathrm{}$, ${Y_1}^{*}\mathrm{}\left(1915\right)\mathrm{}$, ${Y_1}^{*}\mathrm{}\left(2040\right)\mathrm{}$, ${Y_0}^{*}\mathrm{}\left(2100\right)\mathrm{}$, and ${Y_1}^{*}\mathrm{}\left(2260\right)\mathrm{}$. Structure of the $\frac{d\sigma }{d\Omega }\left({180}^{\circ }\right)$ for $K^{-}-p$ elastic scattering is predicted and the differential cross sections in the backward direction are estimated. It is shown that the experimental results for backward $K^{-}-p$ charge-exchange scattering at 1.2-1.7 $\frac{\mathrm{GeV}}{c}$ can be explained fairly well by the effects of the $Y^{*}$'s. Polarization of recoil nucleons in both the $K^{-}+p\to K^{-}+p$ and the $K^{-}+p\to {\overline{K}}^0+n$ reactions is predicted by taking into account the effects of the resonant states.