Estimating decay rate of $X^{\pm}(5568)\to B_s\pi^{\pm}$ while assuming them to be molecular states

Understand

Discovery of $X(5568)$ brings up a tremendous interest because it is very special, i.e.

• made of four different flavors.
• The D0 collaboration claimed that they observed this resonance through portal $X(5568)\to B_s\pi$, but unfortunately, later the LHCb, CMS, CDF and ATLAS collaborations' reports indicate that no such state was found.
• Almost on the Eve of 2017, the D0 collaboration reconfirmed existence of $X(5568)$ via the semileptonic decay of $B_s$.