Pcs(4459) and other possible molecular states from Ξc(*)(D)over-bar(*) and Ξc′(D)over-bar(*) interactions

Recently, the LHCb Collaboration reported a new structure P-cs(4459) with a mass of 19 MeV below the Xi(c)(D) over bar* threshold. It may be a candidate of molecular state from the Xi(c)(D) over bar* interaction. In the current work, we perform a coupled-channel study of the Xi(c)(D) over bar*, Xi'(c)(D) over bar*, Xi(c)*(D) over bar, Xi(c)(D) over bar, Xi(c)'(D) over bar*, and Xi(c)(D) over bar 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 Xi(c)(D) over bar* molecular states are produced with spin parities J(P) = 1/2(-) and 3/2(-). The lower state with 3/2(-) can be related to the observed P-cs(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 Xi(c)'(D) over bar,Xi(c)(D) over bar, and Xi(c)*(D) over bar* thresholds, respectively. As two states near Xi(c)(D) over bar* threshold, two states are produced with 1/2(-) and 3/2(-) near the Xi(c)'(D) over bar* 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 P-cs and P-c states.

Automated summary

The study reports a new molecular state P-cs(4459) and its possible properties, while predicting the existence and characteristics of other strange pentaquark states, providing insights into the origin and internal structure of these exotic heavy flavor states.