五夸克组分在λ（1405）共振辐射和强衰变中的作用
Role of five-quark components in radiative and strong decays of the Lambda(1405) resonance
摘要：
在推广的手征组分夸克模型下，研究了$S_{01}$共振$Λ(1405)$的三夸克和五夸克结构。导出了电磁衰变的螺旋度振幅（$Λ(1405) \to Λ(1116)γ$，$Σ(1194)γ$）和强衰变的跃迁振幅（$Λ(1405)\toΣ(1194)π$，$ K^{-}p$），以及相应的衰变宽度。在$Λ(1405)$中加入约50%的五夸克混合物后，强衰变宽度$Γ_{Λ(1405)\to (Σπ)^\circ}=50\pm 2$ MeV的实验值得到了很好的再现。发现了$Λ^{2}_{1}P_{A}$、$Λ^{2}_{8}P_{M}$和$Λ^{4}_{8}P_{M}$之间的组态混合所引起的重要效应.此外，在$Λ(1405)$共振的辐射衰变和强衰变中，重子中的三夸克和五夸克成分之间的跃迁都是重要的.
英文摘要：
Within an extended chiral constituent quark model, three- and five-quark structure of the $S_{01}$ resonance $Λ(1405)$ is investigated. Helicity amplitudes for the electromagnetic decays ($Λ(1405) \to Λ(1116)γ$, $Σ(1194)γ$), and transition amplitudes for strong decays ($Λ(1405)\toΣ(1194)π$, $ K^{-}p$) are drived, as well as the relevant decay widths. The experimental value for the strong decay width, $Γ_{Λ(1405)\to (Σπ)^\circ}=50\pm 2$ MeV, is well reproduced with about 50% of five-quark admixture in the $Λ(1405)$. Important effects due to the configuration mixings among $Λ^{2}_{1}P_{A}$, $Λ^{2}_{8}P_{M}$ and $Λ^{4}_{8}P_{M}$ are found. In addition, transitions between the three- and five-quark components in the baryons turn out to be significant in both radiative and strong decays of the $Λ(1405)$ resonance.
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