期刊
PHYSICAL REVIEW D
卷 103, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.074007
关键词
-
资金
- National Natural Science Foundation of China [11675228]
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.
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.
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