Does the bottomonium counterpart of $X(3872)$ exist?

Zhi-Yong Zhou, Dian-Yong Chen, Zhiguang Xiao

A narrow line shape peak at about 10615 MeV, just above the threshold in the $B{\bar{B}}^{\ast }$ channel, which can be regarded as the signal of bottomonium counterpart of $X(3872)$, $X_b$…