Decays of Zb(+) and Zb'(+) as hadronic molecules
  The two newly observed hidden-bottom mesons Zb(10610) and Zb'(10650) with quantum numbers J(P) = 1(+) are considered as hadronic molecules composed of BB(*) and B(*)B(*), respectively. We give predictions for the widths of the strong two-body decays Zb(+) to Upsilon(nS) + pi(+) and Zb'(+) to Upsilon(nS) + pi(+) in a phenomenological Lagrangian approach. 
Yubing Dong, Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij
hep-ph