# Interpretation of the newly observed $\Lambda_b(6146)^{0}$ and $\Lambda_b(6152)^0$ states in a chiral quark model

## TL;DR

This paper analyzes the decay properties of certain bottom baryon states using a chiral quark model, proposing explanations for recently observed resonances and suggesting channels for future experimental searches.

## Contribution

It provides a theoretical interpretation of the $ ext{Lambda}_b(6146/6152)$ states as $ ext{Lambda}_b(1D)$ states and predicts decay channels for $ ext{Lambda}_b(2S)$ and $ ext{Sigma}_b(2S)$ states.

## Key findings

- The $ ext{Lambda}_b(6146/6152)$ may be $ ext{Lambda}_b(1D)$ states.
- The $ ext{Lambda}_b(2S)$ state decays mainly into $ ext{Sigma}_b^* ext{pi}$.
- The $ ext{Sigma}_b(2S)$ states decay into $ ext{Lambda}_b ext{pi}$ with widths around 3.8-4.7 MeV.

## Abstract

The strong decays of the low-lying $\lambda$-mode $\Lambda_b(1D,2S)$ and $\Sigma_b(2S)$ states are studied in a chiral quark model. We find that: (i) the newly observed $\Lambda_b(6146/6152)$ resonances in the $\Lambda_b\pi^+\pi^-$ spectrum by the LHCb Collaboration might be explained with the $\lambda$-mode $\Lambda_b(1D)$ states in the quark model. It should be emphasized that whether the structure in the $\Lambda_b\pi^+\pi^-$ spectrum correspond to two states or one state should be further clarified with more observations in future experiments. (ii) The $\Lambda_b(2S)$ $|J^P = \frac{1}{2}^+,0\rangle$ state mainly decays into $\Sigma_b^*\pi$ channel, which may be an ideal channel for searching for this $\Lambda_b(2S)$ state in future experiments. (iii) The $\Sigma_b(2S)$ $|J^P = \frac{1}{2}^+,1 \rangle$ and $|J^P = \frac{3}{2}^+,1 \rangle$ dominantly decay into $\Lambda_b\pi$ with $\Gamma \simeq 3.82$ MeV and $\Gamma \simeq 4.72$ MeV, respectively.