Abstract
We consider X(3872) and Y(4140) as the vector tetraquark states of X c 0 ≡cc-uū-(dd-) and cc-ss-, respectively. By connecting Λb→X c 0 Λ to B - →X c 0 K-, we predict that the branching ratios of Λ b →Λ(X(3872) 0 →)J/ψπ + π - and Λ b →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 Λ b modes would be the first experimental evidences for the XYZ states in baryonic decays.