Bound state of a fermion and an extended dyon

Investigating the bound state of fermions and extended dyons in non-relativ istic as well as in relativistic frameworks, it has been shown that bound s tate energy eigenvalues are modified from those of fermions and point-like dyons due to the presence of massive fields in non-Abelian gauge theory. Th ese fields play a dominating role in forming the bound state. It has also b een shown that an exact solution of Dirac equation for an extended dyon-fer mion system cannot be obtained, due to the presence of a term vanishing mor e rapidly than r(-1) in the potential of this system.