2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54573The bound states of two particles are studied in frames of non-relativistic quantum field model with current $\times$ current type interaction by analyzing the Bethe-Salpeter amplitudes. The Bethe-Salpeter equations are obtained in closed form. The existence of Goldstone mode corresponding to the spontaneous breaking of additional SU(2) symmetry of the model is revealed.9 pagesHigh Energy Physics - Theorytext