Analysis of the hidden-charm pentaquark candidates in the $J/ψΣ$ mass spectrum via the QCD sum rules

Abstract

In this work, we adopt the diquark model, construct the diquark-diquark-antiquark type currents with the light quarks $uus$ in two octets, and study the $uusc\bar{c}$ pentaquark states in the framework of the QCD sum rules systematically. We obtain the mass spectrum of the hidden-charm-singly-strange pentaquark states with the quantum numbers $IJ^{P}=1{\frac{1}{2}}^-$, $1{\frac{3}{2}}^-$ and $1{\frac{5}{2}}^-$. And we can search for those $P_{cs}$ states in the processes $Σ_b^+\to P_{cs}^+ϕ\to J/ψΣ^+ \,ϕ$ and $Ξ_b^0\to P_{cs}^+ K^- \to J/ψΣ^+\, K^-$.