The problem of the Bethe-Salpeter equation for two scalar mesons of equal mass, interacting electromagnetically, is considered in the Landau gauge. A spectral-function representation, depending on two variables, is introduced for the case of arbitrary angular momentum and coupling strength. In the limit of strong binding, a simple momentum-space form of the equations is derived, and the eigenvalues and eigenfunctions are obtained for $l=0, 1$.

• Received 23 March 1973

DOI:https://doi.org/10.1103/PhysRevD.8.3616