Paper detail

Description of the newly observed $Ξ_c^{0}$ states as molecular states

Very recently, three new structures $Ξ_c(2923)^0$, $Ξ(2938)^0$, and $Ξ(2964)^0$ at the invariant mass spectrum of $Λ_c^{+}K^{-}$ observed by the LHCb Collaboration triggers a hot discussion about their inner structure. In this work, we study the strong decay mode of the newly observed $Ξ_c$ assuming that the $Ξ_c$ is a $\bar{D}Λ-\bar{D}Σ$ molecular state. With the possible quantum numbers $J^p=1/2^{\pm}$ and $3/2^{\pm}$, the partial decay widths of the $\bar{D}Λ-\bar{D}Σ$ molecular state into the $Λ_c^{+}K^{-}$, $Σ_c^{+}K^{-}$,and $Ξ_c^{+}π^{-}$ final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the $Ξ(2923)^0$ as $\bar{D}Λ-\bar{D}Σ$ molecule while the decay width of the $Ξ_c(2938)^0$ and $Ξ(2964)^0$ can not be well reproduced in the molecular state picture. In addition, the calculated partial decay widths with $S$ wave $\bar{D}Λ-\bar{D}Σ$ molecular state picture indicate that allowed decay modes, $Ξ_c^{+}π^{-}$, may have the biggest branching ratios for the $Ξ_c(2923)$. The experimental measurements for this strong decay process could be a crucial test for the molecule interpretation of the $Ξ_c(2923)$.