Strong and radiative decays of the doubly charmed baryons

TL;DR

This paper systematically analyzes the strong and radiative decay properties of low-lying doubly charmed baryons, revealing decay widths, dominant excitation modes, and decay ratios, which are crucial for understanding their structure and guiding experimental searches.

Contribution

It provides the first comprehensive theoretical study of decay modes and widths of low-lying doubly charmed baryons, highlighting the significance of radiative transitions and excitation modes.

Findings

$ ext{Xi}_{cc}^*$ and $ ext{Omega}_{cc}^*$ have decay widths of ~15 keV and ~7 keV.

Lowest excited states are dominated by $1P$ $ ho$ mode excitations, which are narrow.

First orbital excitations have widths around 100 MeV with radiative to hadronic decay ratios of about $10^{-3}$.

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 $\Xi_{cc}^*$ and $\Omega_{cc}^*$ 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 $\sim7$ 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 $\Gamma\sim100$ MeV, and the ratio between the radiative and hadronic decay widths is about $\mathcal{O}(10^{-3})$.