Could $Z_b(10610)$ be a $B^{\ast }\bar{B}$ molecular state?

Abstract

Assuming the newly observed structure $Z_b(10610)$ as a bottomonium-like molecular state $B^{\ast }\bar{B}$, we calculate its mass in the framework of QCD sum rules. The numerical result is $10.54\pm 0.22GeV$ for $B^{\ast }\bar{B}$, which coincide with the mass of $Z_b(10610)$. This consolidates the statement made by Belle Collaboration that the $Z_b(10610)$ resonance could be a $B^{\ast }\bar{B}$ molecular state.

Comments: 6 pages, 3 figures; misprints corrected; the version accepted for publication in Phys. Lett. B