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After application of an analytical transformation, a new exact representationfor the nuclear isospin-symmetry breaking correction $\delta_C$ to superallowedbeta decay is obtained. The correction is shown to be essentially thereciprocal of the square of an energy parameter $\Omega_M$ which characterizesthe charge-exchange monopole strength distribution. The proportionalitycoefficient in this relation is determined by basic properties of the groundstate of the even-even parent nucleus, and should be reliably calculable in anyrealistic nuclear model. Therefore, the single parameter $\Omega_M$ containsall the information about the properties of excited $0^+$ states needed todescribe $\delta_C$. This parameter can possibly be determined experimentallyby charge-exchange reactions. Basic quantities of interest are calculatedwithin the isospin-consistent continuum random phase approximation, and thevalues of $\delta_C$ are compared with the corresponding results from otherapproaches.

Relation of isospin-symmetry breaking correction for superallowed beta decay to energy of charge-exchange giant monopole resonance