Solution of the five-body η 4He problem with separable pole expansion method

摘要

The Alt–Grassberger–Sandhas equations for the five-body η ? 4 N problem are solved for the case of the driving ηN and NN potentials limited to s -waves. Separable expansion of the transition amplitudes in all different subsystems is employed to convert the five-body equations into the effective two-body form. Numerical results are presented for the η 4 He scattering length.