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We discuss the possibility and the description of bound states between $B$and $\bar{B}^*$ mesons. We argue that the existence of such a bound state canbe deduced from (i) the weakly bound X(3872) state, (ii) certain assumptionsabout the short range dynamics of the $D\bar{D}^*$ system and (iii) heavy quarksymmetry. From these assumptions the binding energy of the possible$B\bar{B}^*$ bound states is determined, first in a theory containing onlycontact interactions which serves as a straightforward illustration of themethod, and then the effects of including the one pion exchange potential arediscussed. In this latter case three isoscalar states are predicted: a positiveand negative C-parity $^3S_1-{}^3D_1$ state with a binding energy of $20\,{\rmMeV}$ and $6\,{\rm MeV}$ below threshold respectively, and a positive C-parity$^3P_0$ shallow state located almost at the $B\bar{B}^*$ threshold. However,large uncertainties are generated as a consequence of the $1/m_Q$ correctionsfrom heavy quark symmetry. Finally, the newly discovered isovector $Z_b(10610)$state can be easily accommodated within the present framework by a minormodification of the short range dynamics.

Deriving the existence of $B\bar{B}^*$ bound states from the X(3872) and Heavy Quark Symmetry