$\Lambda_c(2910)$ and $\Lambda_c(2940)$ as the conventional baryons dressed with the $D^*N$ channel

TL;DR

This paper models the $\\Lambda_c(2910)^+$ and $\\\Lambda_c(2940)^+$ baryons as conventional $udc$ cores influenced by the $D^*N$ channel, providing a unified interpretation that differs from traditional quark models.

Contribution

It introduces a framework considering both the core and the $D^*N$ channel effects, including interactions, to interpret the baryons' properties, which is a novel approach.

Findings

The mass hierarchy favors $J^P=1/2^-$ for $\Lambda_c(2940)^+$.

The $J^P=3/2^-$ assignment is more likely for $\Lambda_c(2910)^+$.

The model's predictions differ from quenched quark models, highlighting unquenching effects.

Abstract

In this work, we treat $\Lambda_c(2910)^+$ and $\Lambda_c(2940)^+$ as the conventional $udc$ cores dressed with the $D^*N$ channel. We provide a possible interpretation to both $\Lambda_c(2910)^+$ and $\Lambda_c(2940)^+$ within the same framework. In the study, we consider not only the effects between the conventional triquark core and the $D^*N$ channel but also the $D^*N$-$D^*N$ interactions. The mass of $\Lambda_c$ state with $J^P=1/2^-$ is larger than that with $J^P=3/2^-$ in this unquenched picture, which is very different from the prediction of the conventional quenched quark model. Based on the mass spectrum, the spin-parity of $\Lambda_c(2940)^+$ is more likely to be $1/2^-$ while $\Lambda_c(2910)^+$ prefers $3/2^-$. We look forward to the future experiments can test our results with more precise experimental data.