Strong decays of the Ξb (6227) as a Σb K molecule STRONG DECAYS of the Ξb (6227) AS A... YIN HUANG et al.

We study the strong decays of the newly observed Ξb(6227) assuming that it is a pure ΣbK̄ molecular state. Considering four possible spin-parity assingments JP=1/2± and 3/2±, the partial decay widths of the ΣbK̄ molecular state into ΛbK̄, Ξbπ, and Ξb′π final states through hadronic loops are evaluated with the help of the effective Lagrangians. In comparison with the LHCb data, the spin-party 1/2- assignment is preferred while those of JP=1/2+ and JP=3/2± are disfavored. In addition, we show that the two allowed decay modes ΛbK̄ and Ξbπ of the Ξb(6227), being a S-wave ΣbK̄ molecular state, have almost equal branching ratios.