Analysis of the Pcs(4459) as the hidden-charm pentaquark state with QCD sum rules

In this paper, we study the scalar-diquark-scalar-diquark-antiquark-type udscc pentaquark state with the QCD sum rules, the predicted mass M-P = 4.47 +/- 0.11GeV is in excellent agreement with the experimental data 4458.8 +/- 2.9(-1.1)(+4.7)MeV from the LHCb collaboration, and supports assigning the Pcs(4459) to be the hidden-charm pentaquark state with the spin-parity J(P) = 1/2-. We take into account the flavor SU(3) mass-breaking effect, and estimate the mass spectrum of the diquark-diquark-antiquark-type udscc pentaquark states with the strangeness S = -1.

Automated summary

In this paper, the authors studied the udssc pentaquark state using QCD sum rules and found that the predicted mass is in agreement with experimental data, supporting the assignment of Pcs(4459) as the hidden-charm pentaquark state with specific spin-parity. The flavor SU(3) mass-breaking effect was taken into account in estimating the mass spectrum of diquark-diquark-antiquark-type udscc pentaquark states with strangeness S = -1.