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In the present work, we investigate the production mechanism of the$Z_b(10610)$ and $Z_b(10650)$ states from the $\Upsilon(5S,6S)$ decays. Twotypes of bottom-meson loops are discussed. We show that the loop contributionswith all intermediate states being the $S$-wave ground state bottom mesons arenegligible, while the loops with one bottom meson being the broad $B_0^\ast$ or$B_1^\prime$ resonance could provide the dominant contributions to the$\Upsilon(5S) \to Z_b^{(\prime)} \pi$. It is found that such a mechanism is notsuppressed by the large width of the $B_0/B_1'$ resonance. In addition, we alsoestimate the branching ratios for the $\Upsilon(6S) \to Z_b^{(\prime)} \pi$which could be tested by future precise measurements at Belle-II.

Production of the $Z_b^{(\prime)}$ states from the $\Upsilon(5S,6S)$ decays