The $\Lambda$-type P-wave bottom baryon states via the QCD sum rules

Abstract

Our study focuses on the $\Lambda$-type P-wave bottom baryon states with the spin-parity $J^P={\frac{1}{2}}^{-}$, ${\frac{3}{2}}^{-}$. We introduce an explicit P-wave between the two light quarks in the interpolating currents (and the two light quarks are antisymmetric in flavor space, therefore leads to the name $\Lambda$-type baryon) to investigate the ${\Lambda }_b$ and ${\Xi }_b$ states within the framework of the full QCD sum rules. The predicted masses show that the ${\Xi }_b(6087)$ and ${\Xi }_b(6095/6100)$ could to be the P-wave bottom-strange baryon states with the spin-parity $J^P={\frac{1}{2}}^{-}$ and ${\frac{3}{2}}^{-}$, respectively, meanwhile, the ${\Lambda }_b(5912)$ and ${\Lambda }_b(5920)$ could be the P-wave bottom baryon states with the spin-parity $J^P={\frac{1}{2}}^{-}$ and ${\frac{3}{2}}^{-}$, respectively. The ${\Lambda }_b(5920)$ and ${\Xi }_b(6095/6100)$ maybe have two remarkable under-structures or Fock components at least.

Comments: 19 pages, 12 figures, revised version