Study of $P$-wave excitations of observed charmed strange baryons

Abstract

Many excited charmed strange baryons such as ${\Xi }_c(2790)$, ${\Xi }_c(2815)$, ${\Xi }_c(2930)$, ${\Xi }_c(2980)$, ${\Xi }_c(3055)$, ${\Xi }_c(3080)$ and ${\Xi }_c(3123)$ have been observed. In order to understand their internal structure and to determine their spin-parities, the strong decay properties of these baryons as possible $P$-wave excited ${\Xi }_c$ candidates have been systematically studied in a ${}^3{P}_0$ model. The configurations and $J^P$ assignments of ${\Xi }_c(2790)$, ${\Xi }_c(2815)$, ${\Xi }_c(2930)$, ${\Xi }_c(2980)$, ${\Xi }_c(3055)$, ${\Xi }_c(3080)$ and ${\Xi }_c(3123)$ have been explored based on recent experimental data. In our analyses, ${\Xi }_c(3055)$, ${\Xi }_c(3080)$ and ${\Xi }_c(3123)$ seem impossible to be the $P$-wave excited ${\Xi }_c$. ${\Xi }_c(2790)$, ${\Xi }_c(2815)$, ${\Xi }_c(2930)$ and ${\Xi }_c(2980)$ may be the $P$-wave excited ${\Xi }_c$. In particular, ${\Xi }_c(2790)$ and ${\Xi }_c(2815)$ are very possibly the $P$-wave excited ${\Xi }_{c1}(1/2^{-})$ and ${\Xi }_{c1}(3/2^{-})$, respectively. ${\Xi }_c(2980)$ may be the $P$-wave excited ${\Xi }_{c1}^{{}^{\prime }}({\frac{1}{2}}^{-})$. ${\Xi }_c(2930)$ may be the $P$-wave ${\Xi }_{c0}^{{}^{\prime }}({\frac{1}{2}}^{-})$, ${\tilde{\Xi }}_{c0}({\frac{1}{2}}^{-})$, ${\Xi }_{c2}^{{}^{\prime }}({\frac{3}{2}}^{-})$, ${\Xi }_{c2}^{{}^{\prime }}({\frac{5}{2}}^{-})$, ${\tilde{\Xi }}_{c2}({\frac{3}{2}}^{-})$ or ${\tilde{\Xi }}_{c2}({\frac{5}{2}}^{-})$. Furthermore, some branching fraction ratios related to the internal structure and quark configuration of $P$-wave ${\Xi }_c$ have also been computed. Measurements of these ratios in the future will be helpful to understand these excited ${\Xi }_c$.

arXiv comment10 pages, 1 figure, 11 tables, RevTex, to appear in Phys.Rev.D

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