Strong decays of the Pcs(4459) as a $$\Xi_{c}\bar{D}^{\ast}$$ molecule

Abstract

In this work, we study the strong decay of the newly observed Pcs(4459), assuming that it is a pure \(\Xi_{c}\bar{D}^{\ast}\) molecular state. Considering two possible spin-parity assignments JP = 1/2− and JP = 3/2−, the partial decay widths of the \(\Xi_{c}\bar{D}^{\ast}\) molecular state into J/ψΛ, D −s Λ +c , and \(\bar{D}\Xi_{c}^{(\prime)}\) final states through hadronic loops are evaluated with the help of the effective Lagrangians. In comparison with the LHCb data, the S-wave \(\bar{D}^{\ast}\Xi_{c}\) molecular with JP = 1/2− assignment for Pcs(4459) is supported by our study, while the Pcs(4459) in spin-parity JP = 3/2− case may be explained as an S-wave coupled bound state with lager \(\Xi_{c}\bar{D}^{\ast}\) component. In addition, the calculated partial decay widths with JP = 1/2− \(\Xi_{c}\bar{D}^{\ast}\) molecular state picture indicate that allowed decay mode, \(\bar{D}^{\ast}\Xi_{c}^{\prime}\), 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 Pcs(4459).