Canonical interpretations of the newly observed $\Xi_c(2923)^0$, $\Xi_c(2939)^0$ and $\Xi_c(2965)^0$ resonances

Abstract

Three neutral resonances $\Xi_c(2923)^0$, $\Xi_c(2939)^0$ and $\Xi_c(2965)^0$ have been observed in the $\Lambda_c^+ K^-$ mass spectrum by the LHCb Collaboration. Given the $\Xi_c$ and $\Xi_c^\prime$ mass spectra predicted by the constituent quark models, these three resonances are tentatively treated as the $\lambda-$mode $\Xi_c(2S)$, $\Xi_c^\prime(2S)$, $\Xi_c^{\prime *}(2S)$, and $\Xi_c^\prime(1P)$ states, and their strong decay behaviors are calculated within the $^3P_0$ model. Our results indicate that the $\Xi_c(2923)^0$ and $\Xi_c(2939)^0$ can be clarified into the $J^P=3/2^-$ and $5/2^-$ $\Xi_c^\prime(1P)$ states respectively, and the $\Xi_c(2965)^0$ can be regarded as the $J^P=1/2^+$ $\Xi_c^\prime(2S)$ state. Also, we suggest that the previous observed $\Xi_c(2930)$ may be the overlap of two structures $\Xi_c(2923)$ and $\Xi_c(2939)$, and the $\Xi_c(2970)$ should be the same state as $\Xi_c(2965)$. Other theoretical information on the missing $\Xi_c(2S)$, $\Xi_c^{\prime *}(2S)$, and $\Xi_c^\prime(1P)$ states may be helpful for future experimental searches.