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We analyse the Lorentz structure of the matrix elements of the transitions"neutron <-->proton", induced by the charged hadronic vector current. We showthat the term maintaining conservation of the charged hadronic vector currenteven for different masses of the neutron and proton (see T. Leitner et al.,Phys. Rev. C 73, 065502 (2006) and A. M. Ankowski, arXiv:1601.06169 [hep-ph])has a dynamical origin, related to the G-even first class current contribution.We show that because of invariance of strong low-energy interactions under theG-parity transformations, the G-odd contribution with the Lorentz structure$q_{\mu}$, where $q_{\mu}$ is a momentum transferred, does not appear in thematrix elements of the ``neutron <-> proton' transitions.

journal of physics. g, nuclear and particle physics

Lorentz Structure of Vector Part of Matrix Elements of Transitions n <->  p, Caused by Strong Low-Energy Interactions and Hypothesis of Conservation of  Charged Vector Current