$X(5568)$ and and its partner states
  Stimulated by the recent observation of the $X(5568)$, we study the $X(5568)$ and its partners under the tetraquark scenario. In the framework of the color-magnetic interaction, we estimate the masses of the partner states of the $X(5568)$ and discuss their decay pattern, which provide valuable information on the future experimental search of these states. 
Yan-Rui Liu, Xiang Liu, Shi-Lin Zhu
hep-ph hep-ex hep-lat nucl-th