与Λ（1405）类似的超子
Hyperons analogous to the Λ(1405)
摘要：
具有$j^P = 1/2^-$的$Λ(1405)$超子的低质量比基态$Λ(1116)$质量高290 MeV，在夸克模型中难以理解。我们用Skyrme模型的束缚态方法分析了超子谱，该模型成功地描述了$Λ(1116)$和$Λ(1405)$。这个模型预测，几个自旋相同但宇称相反的超子共振形成了质量差约为300 MeV的宇称偶联体，这在观测到的超子谱中确实实现了。此外，该模型预测了$j^P=1/2^-$的$Ξ(1620)$和$Ξ(1690)$的存在。对$Ω$重子和重夸克重子也作了评述。
英文摘要：
The low mass of the $Λ(1405)$ hyperon with $j^P = 1/2^-$, which is higher than the ground state $Λ(1116)$ mass by 290 MeV, is difficult to understand in quark models. We analyze the hyperon spectrum in the bound state approach of the Skyrme model that successfully describes both the $Λ(1116)$ and the $Λ(1405)$. This model predicts that several hyperon resonances of the same spin but with opposite parity form parity doublets that have a mass difference of around 300 MeV, which is indeed realized in the observed hyperon spectrum. Furthermore, the existence of the $Ξ(1620)$ and the $Ξ(1690)$ of $j^P=1/2^-$ is predicted by this model. Comments on the $Ω$ baryons and heavy quark baryons are made as well.
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