Interpretation of the observed $\Lambda_b(6146)^0$ and $\Lambda_b(6152)^0$ states as 1$D$ bottom baryons

TL;DR

This paper interprets the $ ext{Lambda}_b$ states as 1D bottom baryons, explaining their masses and decays, and predicts properties of other unobserved 1D bottom baryons to guide future experiments.

Contribution

The study assigns the $ ext{Lambda}_b(6146)^0$ and $ ext{Lambda}_b(6152)^0$ as 1D bottom baryons with specific quantum numbers, and predicts properties of other unobserved 1D bottom baryons.

Findings

Masses and decay widths match experimental data for the assigned states.

Discrepancy in decay modes suggests need for further investigation.

Predictions for other 1D bottom baryons to assist future experiments.

Abstract

The measured masses and strong decays of $\Lambda_b(6146)^0$ and $\Lambda_b(6152)^0$ required us to decode them as the 1$D$ excited states with $J^P=3/2^+$ and $J^P=5/2^+$, respectively. Under the suggested assignment, the masses and total decay widths of $\Lambda_b(6146)^0$ and $\Lambda_b(6152)^0$ can be explained. As a $J^P=3/2^+$ state, the $\Lambda_b(6146)^0$ should mainly decay into $\Sigma_b(5815)\pi$. However, this theoretical result is in contradiction to the measurement since no significant $\Lambda_b(6146)^0\rightarrow\Sigma_b(5815)^\pm\pi^\mp$ signals were observed by the LHCb. The possible explanations to this difficulty are mentioned. For completeness, we present the prediction of masses and decay widths of other unseen 1$D$ bottom baryons in this work. Our results could provide some important clues for the upcoming experiments.