Width of the exotic Xb (5568) state through its strong decay to Bs0 π+

Abstract

The width of the newly observed exotic state Xb(5568) is calculated via its dominant strong decay to Bs0π+ using the QCD sum rule method on the light cone in conjunction with the soft-meson approximation. To this end, the vertex XbBsπ is studied and the strong coupling gXbBsπ is computed employing for Xb(5568) state the interpolating diquark-antidiquark current of the [su][bd] type. The obtained prediction for the decay width of Xb(5568) is confronted and a nice agreement found with the experimental data of the.