Supersymmetric electroweak corrections to the Higgs boson decays into a chargino or neutralino pair

We investigate the supersymmetric electroweak corrections to the decay widths of the CP-odd and the heavy CP-even Higgs bosons into a chargino or neutralino pair in the framework of the minimal supersymmetric standard model. The corrections involve the contributions of the order O(alpha(ew)m(t(b))(3)/m(W)(3)), O(alpha(ew)m(t(b))(2)/m(W)(2)) and O(alpha(ew)m(t(b))/m(W)). The detailed calculations of the electroweak corrections to the decay processes A(0)/H-0-->(chi) over tilde (+)(1)(chi) over tilde (-)(1) and A(0)/H-0-->(chi) over tilde (0)(2)(chi) over tilde (0)(2) are presented in this paper. We find that these relative corrections may be rather large quantitatively, and can exceed 10% in some regions of parameter space. The corrections to the decay A(0)/H-0-->(chi) over tilde (0)(1)(chi) over tilde (0)(2) can be obtained analogously, but our results show that they are very small and can be neglected.