Search for XYZ states in Λb decays at the LHCb

Abstract

We consider X(3872) and Y(4140) as the vector tetraquark states of Xc0≡cc-uū-(dd-) and cc-ss-, respectively. By connecting Λb→Xc0Λ to B-→Xc0K-, we predict that the branching ratios of Λb→Λ(X(3872)0→)J/ψπ+π- and Λb→Λ(Y(4140)→)J/ψφ are (5.2±1.8)×10-6 and (4.7±2.6)×10-6, which are accessible to the experiments at the LHCb, respectively. The measurements of these Λb modes would be the first experimental evidences for the XYZ states in baryonic decays.