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 $\Sigma_b^+\to P_{ cs}^+\phi \to J/\psi \Sigma^+ \,\phi$ and $\Xi_b^0\to P_{ cs}^+ K^- \to J/\psi \Sigma^+\, K^-$.
Categories: hep-ph