  The eigenvalue problem for the p-wave bound states formed by two unequal-mass
scalar particles through the massive scalar particle exchange is analyzed
numerically in the framework of the Bethe-Salpeter ladder model.
  As in the s-wave case, the eigenvalues of the coupling constant are found to
become complex for some mass configurations in some range of the bound state
mass. The Bethe-Salpeter amplitudes of the low-lying bound states are also
investigated.
