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In the framework of simple assumption on factorizing a mixing of vector statewith isoscalar components in effective amplitudes of isospin breaking caused bythe electromagnetic quark current, a branching fraction of radiative $J/\psi\toa_0$ transition is evaluated at the level of $3\cdot 10^{-3}$.Comment: 3 pages, revtex4 class, 2 eps-figures; reference, comment and  acknowledgement adde

Isospin-symmetry breaking in the scalar and pseudoscalar channels of radiative J/ψ-particle decay