Analysis of the Ξb(6227) as the $\frac {1}{2}^{\pm }$ Pentaquark Molecular States with QCD Sum Rules

Abstract

In this paper, we design the Ξb(6227) as the pentaquark molecular states with quantum numbers $J^{P}=\frac {1}{2}^{\pm }$ to study its inner structure. We employ the QCD sum rule approach to calculate the masses and pole residues of pentaquark molecular states by taking the vacuum condensates up to dimension 13 in the operator product expansion. In comparison with the experiment data, it is found that our calculation results support assigning the Ξb(6227) to be the pentaquark molecular state with quantum number $J^{P}=\frac {1}{2}^{-}$ .