Canonical interpretation of the newly observed Λb(6146)0 and Λb(6152)0 via strong decay behaviors

Abstract

Stimulated by the newly observed ${\mathrm{\ensuremath{\Lambda}}}_{b}(6146{)}^{0}$ and ${\mathrm{\ensuremath{\Lambda}}}_{b}(6152{)}^{0}$ 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 $\ensuremath{\lambda}$-mode ${\mathrm{\ensuremath{\Lambda}}}_{b}(2S)$, ${\mathrm{\ensuremath{\Lambda}}}_{b}(1D)$, ${\mathrm{\ensuremath{\Sigma}}}_{b}(2S)$, and ${\mathrm{\ensuremath{\Sigma}}}_{b}(1P)$ states and then estimate their strong decay widths. Compared with the experimental total widths and decay modes measured by the LHCb Collaboration, the ${\mathrm{\ensuremath{\Lambda}}}_{b}(6146{)}^{0}$ and ${\mathrm{\ensuremath{\Lambda}}}_{b}(6152{)}^{0}$ can be reasonably clarified into the ${J}^{P}=5/{2}^{+}$ and ${J}^{P}=3/{2}^{+}$ ${\mathrm{\ensuremath{\Lambda}}}_{b}(1D)$ states, 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.