The contribution of weak interaction to the hyperfine splitting of levels of hydrogen-like atoms

Using a standard model of the weak electric interactions, we calculate the contribution of weak neutral currents to the shift of energy levels of hydrogen-like atoms. The Logunov-Takhvelidze quasipotential method is used to obtain the weak-interaction potential between particles in the nonrelativistic approximation. We calculate the contribution of the P-even part of this potential to the hyperfine splitting of levels of muonium and muonic hydrogen.