The strong decays of the low-lying $\rho$-mode $1P$-wave singly heavy baryons

TL;DR

This paper systematically studies the strong decay properties of low-lying $ ho$-mode $1P$-wave singly heavy baryons using the chiral quark model, providing insights into their quantum states and guiding future experimental searches.

Contribution

It offers the first comprehensive decay analysis of $ ho$-mode $1P$-wave heavy baryons within the $j$-$j$ coupling scheme, clarifying the nature of recently observed states.

Findings

The $ ho$-mode $1P$-wave $ ext{Λ}_c(2910)^+$ is likely a $J^P=5/2^-$ state.

The $ ext{Ξ}_b(6227)^-$ favors a $J^P=5/2^-$ assignment.

Missing $ ho$-mode $1P$-wave states are predicted to be broad or narrow, guiding experimental searches.

Abstract

We have systematically calculated the strong decays of the low-lying $\rho$-mode $1P$-wave $\Lambda_{c(b)}$, $\Sigma_{c(b)}$, $\Xi_{c(b)}$, $\Xi^{'}_{c(b)}$, $\Omega_{c(b)}$ baryons using the chiral quark model within the $j$-$j$ coupling scheme. For the controversial states, our results indicate: (i) For the singly charmed heavy baryons, the newly observed $\Lambda_{c}(2910)^+$ is a good candidate of the $J^P=5/2^-$ state $\Lambda_c|J^{P}=\frac{5}{2}^{-},2\rangle_{\rho}$. (ii) For the singly bottom heavy baryons, the $\Xi_{b}(6227)^-$ favors the $J^{P}=5/2^{-}$ state $\Xi_{b}|J^{P}=\frac{5}{2}^{-},2\rangle_{\rho}$. (iii) The other missing $\rho$-mode $1P$-wave excitations in $\Lambda_{b}$, $\Sigma_{c(b)}$ and $\Xi^{'}_{c(b)}$ families appear to be broad structures with $\Gamma$$\sim$(100-200) MeV, and their strong decay widths are sensitive to their masses. (iv) The $\rho$-mode $1P$-wave $\Xi_{c(b)}$ and $\Omega_{c(b)}$ baryons have a relatively narrow decay width of a few MeV or a few tens of MeV, and have a good potential to be observed in forthcoming experiments.