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 λ 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 λ for small values of the exchange mass.
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