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It is argued that the ratio of the yield of pairs of charged and neutral$B^{(*)}$ mesons in the processes $\Upsilon(5S) \to \pi^0 + (B \bar B^* +c.c.)$ and $\Upsilon(5S) \to \pi^0 + B^* \bar B^*$ is very sensitive near thecorresponding heavy meson threshold to the strong interaction between themesons in the $I^G(J^P)=0^-(1^+)$ channel due to significant isospin breakingby the Coulomb force. This channel, not readily accessible by other means, maycontain near-threshold molecular meson-antimeson resonances --- isoscalaranalogs of the isovector states $Z_b(10610)$ and $Z_b(10650)$.

Charged-to-neutral heavy meson yield ratio at the Z_b^0 resonances as a probe of the I^G(J^P)=0^-(1^+) channel