Low-Energy Photoproduction ofΛ0andK+from Protons

Abstract

A model is constructed for low-energy $\gamma +p\to K^{+}+{\Lambda }^0$ reactions in accordance with dispersion theory by neglecting faraway singularities. Thus, besides the Born terms due to one-nucleon intermediate state and $K^{+}$ exchange, we also employ the $K^{*}$ exchange and a resonance in the final state similar to that found in the reaction ${\pi }^{-}+p\to K^0+{\Lambda }^0$. A fairly good fit with recently measured data is obtained. [R. L. Anderson et al., Phys. Rev. Letters 9, 131 1962.] The choice of parameters is briefly discussed.