The spin-parity structure of the $(K^{-}\pi^{+})$ and $(\overline{K}^{0}\pi^{+}\pi^{-})$ systems produced in charged exchange reactions

Partial wave analyses have been performed for the $(K^-\pi^+)$ and $(K^{-O}\pi^+\pi^-)$ systems produced in the reactions $K^-p\to K^-\pi^+$ n and $K^-p\to K^{-O}\pi^+\pi^-$ n, respectively. It is found that the S-wave $(K^-\pi^+)$ system is consistent with a Breit-Wigner shape peaked at 1.3 GeV and 0.6 GeV wide . The low mass $(K^{-O}\pi^+\pi^-)$ system composed mainly of $J^P$ = $o^-$ , $l^+$ and $2^+$ states, resembles in its structure the $(K^{\pi}{\pi}^-)$ ­ system produced in diffractive reactions. This implies, in particular , that the presence of unnatural spin-parity states produced by natural parity exchanges cannot be considered as an exclusive characteristic of diffractive processes. A method of analysing the $(N^{\pi})$ systems is described.