Weak axial exchange currents for the Bethe–Salpeter equation Original Research Article

We construct weak axial one-boson exchange currents for the Bethe–Salpeter equation, starting from chiral Lagrangians of the View the MathML source system. The currents fulfill the Ward–Takahashi identities and the matrix element of the full current between the two-body solutions of the Bethe–Salpeter equation satisfies the PCAC constraint exactly.