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 ${\Xi }_c(2S)$, ${\Xi }_c^{\prime }(2S)$, ${\Xi }_c^{\prime \ast }(2S)$, and ${\Xi }_c^{\prime }(1P)$ states, and their strong decay behaviors are calculated within the ${}^3{P}_0$ 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 ${\Xi }_c(2S)$, ${\Xi }_c^{\prime \ast }(2S)$, and ${\Xi }_c^{\prime }(1P)$ states may be helpful for future experimental searches.

Comments: 7 pages, 2 figures, some important corrections, suggestions and comments are welcome