Strong decays of the Pcs(4459) as a Ξc(D)over-bar* molecule

In this work, we study the strong decay of the newly observed P-cs(4459), assuming that it is a pure Xi(c)(D) over bar* molecular state. Considering two possible spin-parity assignments J(P) = 1/2(-) and J(P) = 3/2(-), the partial decay widths of the Xi(c)(D) over bar* molecular state into J/psi Lambda, D-s(-)Lambda(+)(c), and D Xi(('))(c) final states through hadronic loops are evaluated with the help of the effective Lagrangians. In comparison with the LHCb data, the S-wave (D) over bar*Xi(c) molecular with J(P) = 1/2(-) assignment for P-cs(4459) is supported by our study, while the P-cs(4459) in spin-parity J(P) = 3/2(-) case may be explained as an S-wave coupled bound state with lager Xi(c)(D) over bar* component. In addition, the calculated partial decay widths with J(P) = 1/2(-) Xi(c)(D) over bar* molecular state picture indicate that allowed decay mode, (D) over bar Xi(')(c), may have the biggest branching ratio. The experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the P-cs(4459).

Automated summary

This work studies the strong decay process of the newly observed P-cs(4459), suggesting it as a pure Xi(c)(D) over bar* molecular state. By evaluating partial decay widths, it supports the S-wave (D) over bar*Xi(c) molecular state for P-cs(4459, with a J(P) = 1/2(-) assignment, and suggests that the P-cs(4459) in the J(P) = 3/2(-) case might be explained as a coupled bound state with a larger Xi(c)(D) over bar* component. The experimental measurements of this strong decay could be essential for verifying the molecule interpretation of P-cs(4459).