Abstract:
Coupled radial equations are derived for the ladder approximation Bethe-Salpeter equation describing a system of two spin-(1/2) particles of unequal masses interacting to form a bound state of total mass zero. The numerical behavior of the coupling parameter ? as a function of the mass ratio is examined for known analytical equal-mass solutions. In addition a perturbation method is employed to investigate the behavior of ? for small values of the exchange mass. Copyright