Spin partners of the $Z_b(10610)$ and $Z_b(10650)$ revisited

V. Baru, E. Epelbaum, A. A. Filin +2

We study the implications of the heavy-quark spin symmetry for the possible spin partners of the exotic states $Z_b(10610)$ and $Z_b(10650)$ in the spectrum of bottomonium. We form…