Hadronic coupling constants of the lowest hidden-charm pentaquark state,using QCD sum rules with rigorous quark-hadron duality

• 作者: Zhigang Wang Huijuan Wang Qi Xin
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 37-55
• 页数: 19页
• 语种: 英文
• DOI: 10.1088/1674-1137/abf13b

摘要

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 low-est diquark-diquark-antiquark type hidden-charm pentaquark state with spin-parity JP =1-/2 in detail,and calculate the partial decay widths.The total width Γ(Pc)=14.32±3.31 MeV is compatible with the experimental valueΓPc(4312) =9.8 ± 2.7+3.7-4.5 MeV from the LHCb collaboration,and favors assigning the Pc(4312) to be the[ud][uc](c)pentaquark state with JP =1-/2.The hadronic coupling constants have the relation |GPD-∑c++| =√2|GP(D)0∑c+| ＞＞|GP(D)0Ac+|,and favor the hadronic dressing mechanism.The Pc(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)∑c lead to some pentaquark molecule components,and the Pc(4312) may spend a rather large time as the (D)∑c mo-lecular state.