Analysis of the strong decay X(5568) → Bₛ⁰π ⁺ X ( 5568 ) → B s 0 π + with QCD sum rules

In this article, we take the X(5568) to be the scalar diquark–antidiquark type tetraquark state, study the hadronic coupling constant gXBₛπ with the three-point QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension-6 and including both the connected and the disconnected Feynman diagrams; then we calculate the partial decay width of the strong decay X(5568) → Bₛ⁰ π ⁺ and obtain the value Γ X=( 20.5± 8.1) \,MeV , which is consistent with the experimental data Γ X = ( 21.9 ± 6.4 +5.0-2.5) \,MeV from the D0 collaboration.