Mixing model for bottomoniumlike Zb resonances

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The isovector bottomoniumlike exotic resonances Zb(10610) and Zb(10650) are very close to the thresholds of heavy meson pairs BB∗(BB∗) and B∗B∗, and are naturally understood as "molecular" states made of the corresponding meson-antimeson pairs. The picture with a full separation of the two channels cannot be exact and a cross-feed between the states necessarily takes place. A simple model is considered here describing the mixing between the channels in terms of one parameter. The model reasonably describes the current data on the decays of the Zb resonances to bottomonium plus a pion and predicts the rate and a distinctive interference pattern for the decay Zb(10650)→BB∗(BB∗) as well as excess of the mass splitting between the resonances over the mass difference between B∗ and B mesons.

Original languageEnglish (US)
Article number094024
JournalPhysical Review D
Issue number9
StatePublished - Nov 27 2017

Bibliographical note

Funding Information:
This work is supported in part by U.S. Department of Energy Grant No. DE-SC0011842.

Publisher Copyright:
© 2017 American Physical Society.


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