The $1D$, $2D$ ${\Xi }_b$ and ${\Lambda }_b$ baryons

Abstract

Recently, scientists have made great progresses in experiments in searching for the excited states of ${\Xi }_b$ and ${\Lambda }_b$ baryons such as the ${\Lambda }_b(6072)$, ${\Lambda }_b(6146)$, ${\Lambda }_b(6152)$, ${\Xi }_b(6227)$, ${\Xi }_b(6100)$, ${\Xi }_b(6327)$ and ${\Xi }_b(6333)$. Stimulated by these progresses, we give a systematical analysis about the $1D$ and $2D$ states of ${\Xi }_b$ and ${\Lambda }_b$ baryons with the method of QCD sum rules. By constructing three types of interpolating currents, we calculate the masses and pole residues of these heavy baryons with different excitation modes $(L_{\rho },L_{\lambda })=(0,2)$, $(2,0)$ and $(1,1)$. As a result, we decode the inner structures of ${\Lambda }_b(6146)$, ${\Lambda }_b(6152)$, ${\Xi }_b(6327)$ and ${\Xi }_b(6333)$, and favor assigning these states as the $1D$ baryons with the quantum numbers $(L_{\rho },L_{\lambda })=(0,2)$ and ${\frac{3}{2}}^{+}$, ${\frac{5}{2}}^{+}$, ${\frac{3}{2}}^{+}$ and ${\frac{5}{2}}^{+}$, respectively. In addition, the predictions about the masses and pole residues of the other $1D$ and $2D$ states of ${\Xi }_b$ and ${\Lambda }_b$ baryons in this paper are helpful in studying the D-wave bottom baryons in experiments in the future.

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• Predicted ${\Xi }_b(6087{)}^0$ and further predictions
• Decay widths and mass spectra of single bottom baryons
• Heavy quark dominance in orbital excitation of singly and doubly heavy baryons
• The $\Lambda$-type P-wave bottom baryon states via the QCD sum rules
• Probing the inner structures of the observed ${\Xi }_b$ and ${\Xi }_b^{\prime }$ resonances