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 ${\Lambda }_c^{+}(2593)$, ${\Lambda }_c^{+}(2625)$, ${\Sigma }_c^{++,+,0}$ and ${\Sigma }_c^{+,0}(2520)$, are accounted for successfully, which allows 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 both ${\Lambda }_c(2880)$ and ${\Lambda }_c(2940)$ are $D$-wave states in the N=2 shell; ${\Lambda }_c(2880)$ could be $|{\Lambda }_c^2{D}_{\lambda \lambda }{3/2}^{+}>$ and ${\Lambda }_c(2940)$ could be $|{\Lambda }_c^2{D}_{\lambda \lambda }{5/2}^{+}>$. Our calculation also suggests that ${\Lambda }_c(2765)$ is very likely a $\rho$-mode $P$-wave excited state in the N=1 shell, and favors a $|{\Lambda }_c^4{P}_{\rho }1/2^{-}>$ configuration. The ${\Sigma }_c(2800)$ favors being a $|{\Sigma }_c^2{P}_{\lambda }{1/2}^{-}>$ state. But its being |\Sigma^{++}_c ^4 P_\lambda{5/2}^-> cannot be ruled out.

Comments: 22 pages, 16 tables; typos corrected;version to appear in PRD