Reaction $K^{-}+p\to K^{-}+p+{\pi }^{-}+{\pi }^{+}$ at 4.6 and 5.0 GeV/c; Evaluation of $K^{-}{\pi }^{-}$ Scattering Cross Section

The reaction $K^{-}+p\to K^{-}+p+{\pi }^{-}+{\pi }^{+}$ near 5.0 BeV/c has been examined. In events of the type $K^{-}+p\to K^{*0\mathrm{}}\mathrm{}\left(890\right)+p+{\pi }^{-}$ one-pion exchange appears to explain the interaction. Analysis of the scattering angular distribution at the ${\pi }^{-}p$ vertex indicates that the $p$ and ${\pi }^{-}$ are produced as if scattering of the virtual exchanged pion is real. Similar analysis of events of the type $K^{-}+p\to N^{*++}\mathrm{}\left(1236\right)+K^{-}+{\pi }^{-}$, with the assumption of real scattering between the $K^{-}$ and ${\pi }^{-}$, yields information on the elastic differential, total elastic, and total cross sections of $K^{-}{\pi }^{-}$ scattering.