Energy dependence of K  − -“pp” effective potential derived from coupled-channel Green’s function

Abstract

We investigate the energy dependence of a single-channel effective potential between the K − and the "pp"-core nucleus, which can be obtained as an K − -"pp" equivalent local potential from a coupled-channel model forK(NN)-π(Σ N) systems. It turns out that the imaginary part of the resultant potential near the πΣ N decay threshold can well approximate the phase space suppression factor of K − pp → πΣ N decay modes. The effects on the pole position of the π(Σ N) state in the πΣ N channel are also discussed.