期刊
CHINESE PHYSICS C
卷 45, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1137/abf13b
关键词
pentaquark states; QCD sum rules; XYZ particles
资金
- National Natural Science Foundation of China [11775079]
In this study, hadronic coupling constants for pentaquark states were calculated using QCD sum rules, revealing the possible nature of the P-c(4312) as a [ud][uc](c) over bar pentaquark state. The research suggests that the P-c(4312) may exist for a considerable time as a (D) over bar Sigma(c) molecular state.
In this article, we illustrate how to calculate the hadronic coupling constants of the pentaquark states with QCD sum rules based on rigorous quark-hadron quality. We then study the hadronic coupling constants of the lowest diquark-diquark-antiquark type hidden-charm pentaquark state with spin-parity J(p) = 1/2(-) detail, and calculate the partial decay widths. The total width Gamma(P-c) = 14.32 +/- 3.31 MeV is compatible with the experimental value Gamma p(c(4312)) = 9.8 +/- 2.7(-4.)(5)(+3.7) MeV from the LHCb collaboration, and favors assigning the P-c(4312) to be the [ud][uc](c) over bar pentaquark state with J(P) = 1/2(-). The hadronic coupling constants have the relation vertical bar G(PD)(-Sigma c++)vertical bar = root 2 vertical bar G(P (D) over bar0 Sigma c+)vertical bar >>vertical bar G(P (D) over bar0 Lambda c+)vertical bar, and favor the hadronic dressing mechanism. The P-c(4312) may have a diquark-diquark-antiquark type pentaquark core with the typical size of the qqq-type baryon states. The strong couplings to the meson-baryon pairs (D) over bar Sigma(c), lead to some pentaquark molecule components, and the P-c(4312) may spend a rather large time as the (D) over bar Sigma(c) molecular state.
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