Canonical interpretation of the newly observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ via strong decay behaviors

Abstract

Stimulated by the newly observed ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ resonances, we investigate the strong decays of the low-lying singly bottom baryons within the quark pair creation model. Considering their masses and decay modes, we tentatively assign these states as the $\lambda -$ mode ${\Lambda }_b(2S)$, ${\Lambda }_b(1D)$, ${\Sigma }_b(2S)$, and ${\Sigma }_b(1P)$ states, and then estimate their strong decay widths. Compared with the experimental total widths and decay modes measured by the LHCb Collaboration, the ${\Lambda }_b(6146{)}^0$ and ${\Lambda }_b(6152{)}^0$ can be reasonably clarified into the $J^P=5/2^{+}$ and $J^P=3/2^{+}$ ${\Lambda }_b(1D)$ sates respectively, while other canonical assignments are disfavored. Other low-lying bottom states are also presented, where various narrow states may have good potential to be observed in future LHCb experiments.

Comments: 8 pages, 3 figures