Double scattering and final-state interaction in\(Xd \to Y{\mathcal{N}}{\mathcal{N}}\)

A unified approach to double scattering, as well as the final-state interaction of the two nucleons at small and large momentum transfers are given. The closure sum rule for the final-state interaction at small momentum transfers is shown explicitly in a simple model for the deuteron wave function and nucleon interaction. An application for the process K+d→K0pp is given, trying to explain discrepancies present in recent experiments.