$B_s\pi$--$B\bar{K}$ interactions in finite volume and the $X(5568)$

Jun-Xu Lu, Xiu-Lei Ren, Li-Sheng Geng

The recent observation of $X(5568)$ by the D0 Collaboration has aroused a lot of interest both theoretically and experimentally. In the present work, we first point out that $X(556…