Title: Charmed baryon strong decays in a chiral quark model
Abstract: Charmed baryon strong decays are studied in a chiral quark model. The data for the decays of ${\ensuremath{\Lambda}}_{c}^{+}(2593)$, ${\ensuremath{\Lambda}}_{c}^{+}(2625)$, ${\ensuremath{\Sigma}}_{c}^{++,+,0}$, and ${\ensuremath{\Sigma}}_{c}^{+,0}(2520)$ are accounted for successfully, which allows one to fix the pseudoscalar-meson-quark couplings in an effective chiral Lagrangian. Extending this framework to analyze the strong decays of the newly observed charmed baryons, we classify that ${\ensuremath{\Lambda}}_{c}(2880)$ and ${\ensuremath{\Lambda}}_{c}(2940)$ as $D$-wave states in the $N=2$ shell; ${\ensuremath{\Lambda}}_{c}(2880)$ could be $|{\ensuremath{\Lambda}}_{c}^{2}D_{\ensuremath{\lambda}\ensuremath{\lambda}}{\frac{3}{2}}^{+}⟩$ and ${\ensuremath{\Lambda}}_{c}(2940)$ could be $|{\ensuremath{\Lambda}}_{c}^{2}D_{\ensuremath{\lambda}\ensuremath{\lambda}}{\frac{5}{2}}^{+}⟩$. Our calculation also suggests that ${\ensuremath{\Lambda}}_{c}(2765)$ is very likely a $\ensuremath{\rho}$-mode $P$-wave excited state in the $N=1$ shell, and favors a $|{\ensuremath{\Lambda}}_{c}^{4}P_{\ensuremath{\rho}}{\frac{1}{2}}^{\ensuremath{-}}⟩$ configuration. The ${\ensuremath{\Sigma}}_{c}(2800)$ favors being a $|{\ensuremath{\Sigma}}_{c}^{2}P_{\ensuremath{\lambda}}{\frac{1}{2}}^{\ensuremath{-}}⟩$ state. But its being $|{\ensuremath{\Sigma}}_{c}^{++}^{4}P_{\ensuremath{\lambda}}{\frac{5}{2}}^{\ensuremath{-}}⟩$ cannot be ruled out.