Boson exchange quasipotentials for a pseudoscalar fermion—antifermion bound state

An explicit form of equations for a relativistic wave function of a fermion-antifermion pair with J^P = 0^– is obtained in the framework of covariant single-time approach. The cases of vector, scalar, pseudovector, and pseudoscalar boson exchange are considered.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 29–31, July, 1991.