Charmed baryon strong decays in a chiral quark model

TL;DR

This paper uses a chiral quark model to analyze charmed baryon decays, successfully classifying several newly observed states and proposing their internal quark configurations based on decay data.

Contribution

It extends a chiral quark model framework to classify and interpret the structure of newly observed charmed baryons, providing specific quantum number assignments.

Findings

Confirmed decay data for known charmed baryons

Classified $ ext{Lambda}_c(2880)$ and $ ext{Lambda}_c(2940)$ as D-wave states

Suggested $ ext{Lambda}_c(2765)$ as a P-wave $ ho$-mode excitation

Abstract

Charmed baryon strong decays are studied in a chiral quark model. The data for the decays of $\Lambda^+_c(2593)$, $\Lambda^+_c(2625)$, $\Sigma^{++,+,0}_c$ and $\Sigma^{+,0}_c(2520)$, 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 $|\Lambda_c ^4P_\rho 1/2^->$ configuration. The $\Sigma_c(2800)$ favors being a $|\Sigma_c ^2P_\lambda{1/2}^->$ state. But its being $|\Sigma^{++}_c ^4 P_\lambda{5/2}^->$ cannot be ruled out.