ModifiedK*Exchange Model forΛK0Production

A model is proposed to explain simultaneously the backward peaking of the $\Lambda$ particles in the reaction ${\pi }^{-}+p-\Lambda +K^0$, the large polarization observed, and the peak of the total cross section. The $K^{*}$ exchange diagram and a resonant state in our channel are considered as the main contributions to the amplitudes. By assuming a resonant $p_{\frac{1}{2}}$ state, excellent fits to the angular distribution and polarization are obtained at a pion kinetic energy of 871 MeV and at an incident pion momentum of 1.01-1.05 BeV/c. A fairly good fit is obtained at a pion kinetic energy of 791 MeV. A new estimate for the $K^{*}\Lambda N$ coupling constant is given.