Interpretation of the observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ states as 1$D$ bottom baryons

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 ${\Lambda }_b(6146{)}^0\to {\Sigma }_b(5815{)}^{\pm }{\pi }^{\mp }$ 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.

Comments: 8 pages, 3 figures, 8 tables, matches published version