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Bottomonium-like resonances Zb(10610) and Z′ b(10650) are good candidates of hadronic molecules composed of BB∗ (or B∗B) and B∗B∗, respectively. In this chapter, considering Z b as heavy meson molecules, we investigate the decays of Z b → Υ(nS)π + in terms of the heavy meson effective theory. We find that the intermediate B(∗) and B(∗) meson loops and the form factors play a significant role to reproduce the experimental values of the decay widths.

Analysis of Zb decays as heavy meson molecules