Nucleon antinucleon bound states

A system of bound nucleon-antinucleon, with the quantum numbers of various scalar and pseudoscalar existing particles and resonances is studies with a Bethe Salpeter equation in the ladder approximation. The interaction is produced byπ-mesons. The effect of a phenomenological vector interaction is also checked. The bound states are classified according to their isotopic spin,G parities, parities, nucleonic number, spin and masses. To obtain the experimental value for the coupling constant (g_{Nbar Npi } ) the used model requires for a cut off values between 0.3 to 5 nucleonic masses. The effect of the vector interaction is always attractive.