| Popis: |
Recently, the LHCb Collaboration reported a new structure Pcs(4459) with a mass of 19 MeV below the ΞcD¯* threshold. It may be a candidate of molecular state from the ΞcD¯* interaction. In the current work, we perform a coupled-channel study of the Ξc*D¯*, Ξc′D¯*, Ξc*D¯, ΞcD¯*, Ξc′D¯, and ΞcD¯ interactions in the quasipotential Bethe-Salpeter equation approach. With the help of the heavy quark chiral effective Lagrangian, the potential is constructed by light meson exchanges. Two ΞcD¯* molecular states are produced with spin parities JP=1/2− and 3/2−. The lower state with 3/2− can be related to the observed Pcs(4450) while two-peak structure cannot be excluded. Within the same model, other strange hidden-charm pentaquarks are also predicted. Two states with spin parities 1/2− and a state with 3/2− are predicted near the Ξc′D¯, ΞcD¯, and Ξc*D¯ thresholds, respectively. As two states near ΞcD¯* threshold, two states are produced with 1/2− and 3/2− near the Ξc′D¯* threshold. The couplings of the molecular states to the considered channels are also discussed. The experimental research of those states are helpful to understand the origin and internal structure of the Pcs and Pc states. |
