Study of theK−d→K−π+π−pnReaction at 2.24 BeV/c

Abstract

Results are reported for the following reactions: $K^{-}n\to K^{-}{\pi }^{+}{\pi }^{-}n$ (301 events), $K^{-}p\to K^{-}{\pi }^{+}{\pi }^{-}p$ (317 events), $K^{-}d\to K^{-}{\pi }^{+}{\pi }^{-}d$ (11 events), and $K^{-}d\to K^{-}{\pi }^{+}{\pi }^{-}\mathrm{pn}$ where both nucleons have laboratory momenta greater than 250 MeV/c (245 events). The $K^{-}n$ reaction is dominated by the $N^{*-}{K}^{-}{\pi }^{+}\left[\right(71\mathrm{}\pm 7)\%]$ final state. The $K^{-}p$ reaction exhibits $K^{-}{\pi }^{-}{N}^{*++}\left[\right(27\mathrm{}\pm 5)\%]$, $K^{-}{\pi }^{+}{N}^{*0\mathrm{}}\left[\right(16\mathrm{}\pm 5)\%]$, $K^{*0\mathrm{}}{N}^{*0\mathrm{}}\left[\right(11\mathrm{}\pm 4)\%]$, and $Y_0^{}{}_{}{}^{*}\mathrm{}\left(1520\right)\mathrm{}{\pi }^{+}{\pi }^{-}\left[\right(9\mathrm{}\pm 3)\%]$ production. Phase-space background accounts for about 25% of the reaction. The $K^{-}d\to K^{-}{\pi }^{+}{\pi }^{-}\mathrm{pn}$ reaction with two high-momentum nucleons shows production of the $N^{*-}$ and $N^{*++}$. There is very little ${\overline{K}}^{*0\mathrm{}}$ production.