Present status of the Bethe-Salpeter approach in Minkowski space

Understand

Recently developed methods allowing to find the solutions of the Bethe-Salpeter equations in Minkowski space, both for the bound and scattering states, are reviewed.

• For the bound states, one obtains the bound state mass and the corresponding BS amplitude.
• For the scattering states, the phase shifts (complex above the meson creation threshold) and the half-off-shell BS amplitude are found.
• Using these solutions, the elastic and transition electromagnetic form factors are calculated.