Scattering theory for composite particles

A method is proposed for describing the scattering and bound states of two particles (which may be either elementary or composite) whose interaction consists of short- and long-range terms with very different ranges. The method is a generalization of Landau and Smorodinskii's theory of proton-proton scattering, which describes the combined effect of Coulomb and nuclear forces, to include forces of any nature and the case of composite particles. As an example, the problem of elastic proton-deuteron scattering at low energies is solved by reducing it to the analogous neutron-deuteron scattering problem