Production of the Zb(′) states from the ϒ (5S,6S) decays

In the present work, we investigate the production mechanism of the Zb(10610) and Zb(10650) states from the ϒ (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, wh...

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Bibliographic Details
Published in:Physical review. D 2019-02, Vol.99 (3), p.1
Main Authors: Wu, Qi, Chen, Dian-Yong, Guo, Feng-Kun
Format: Article
Language:English
Subjects:
Mesons
Online Access:Get full text
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Summary:In the present work, we investigate the production mechanism of the Zb(10610) and Zb(10650) states from the ϒ (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 B0* or B1′ resonance could provide the dominant contributions to the ϒ (5S)→Zb(′)π. It is found that such a mechanism is not suppressed by the large width of the B0/B1′ resonance. In addition, we also estimate the branching ratios for the ϒ (6S)→Zb(′)π which could be tested by future precise measurements at Belle-II.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.99.034022