Strong and radiative decays of the doubly charmed baryons

Abstract

We have systematically studied the strong and radiative decays of the low-lying $1P$-wave doubly charmed baryons. Some interesting observations are: (i) The states ${\Xi }_{cc}^{\ast }$ and ${\Omega }_{cc}^{\ast }$ with $J^P=3/2^{+}$ have a fairly large decay rate into the ${\Xi }_{cc}\gamma$ and ${\Omega }_{cc}\gamma$ channels with a width $\sim 15$ and $\sim 7$ keV, respectively. (ii) The lowest lying excited doubly charmed baryons are dominated by the $1P$ $\rho$ mode excitations, which should be quite narrow states. They decay into the ground state with $J^P=1/2^{+}$ through the radiative transitions with a significant ratio. (iii) The total decay widths of the first orbital excitations of $\lambda$ mode ($1P_{\lambda }$ states with $J^P=1/2^{-}$, $3/2^{-}$, $5/2^{-}$) are about $\Gamma \sim 100$ MeV, and the ratio between the radiative and hadronic decay widths is about $\mathcal{O}(10^{-3})$.

Comments: 10 pages, 7 figures