Decays and productions via bottomonium for Z_b resonances and other B anti-B molecules

Understand

We discuss decays and productions for the possible molecular states formed by bottom mesons B (B*) and anti-B (anti-B*).

• The twin resonances found by Belle, Zb(10610) and Zb(10650), are such candidates.
• The spin wave functions of the molecular states are rearranged into those of heavy and light spin degrees of freedom by using the re-coupling formulae of angular momentum.
• By applying the heavy quark symmetry we derive model independent relations among various decay and production rates, which can be tested in experiments.