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arXiv · 1810.09696

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

Qi Wu·Dian-Yong Chen·Feng-Kun Guo
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Abstract

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. Two types of bottom-meson loops are discussed. We show that the loop contributions with all intermediate states being the $S$-wave ground state bottom mesons are negligible, 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 not suppressed by the large width of the $B_0/B_1'$ resonance. In addition, we also estimate the branching ratios for the $\Upsilon(6S) \to Z_b^{(\prime)} \pi$ which could be tested by future precise measurements at Belle-II.

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Qi Wu, Dian-Yong Chen, Feng-Kun Guo. 2018-10-23. Production of the $Z_b^{(\prime)}$ states from the $\Upsilon(5S,6S)$ decays. https://doi.org/10.1103/physrevd.99.034022

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