On the Mesonic Correction to the {beta}-Decay

General types of the mesonic correction to the β-decay are obtained from the invariance requirements. Explicit calculations are performed, using Feynman-Dyson method, up to the second order of meson-nucleon coupling constants for the synmetrical pseudoscalar meson theory with both pseudoscalar and pseudovector couplings. It is shown that the mesonic correction is small and does not affect the selection rules and spectra in the Konopinski's forbidden theory.