Low-energy data on the three charge states in \(\gamma p \rightarrow K^+(\varSigma \pi )\) from CLAS at JLab, on \(K^-p\rightarrow \pi ^0\pi ^0\varLambda \) and \(\pi ^0\pi ^0\varSigma \) from the Crystal Ball at BNL, bubble chamber data on \(K^-p\rightarrow \pi ^-\pi ^+\pi ^{\pm }\varSigma ^{\mp }\), low-energy total cross sections on \(K^-\) induced reactions, and data on the \(K^-p\) atom are fitted with the BnGa partial-wave-analysis program. We find that the data can be fitted well with just one isoscalar spin-1/2 negative-parity pole, the \(\varLambda (1405)\), and background contributions. In a fit with one isocsalar state, the \(\varLambda (1405)\) structure can be determined as a dominantly SU(3) singlet state. A fit with two isoscalar singlet states, with imposed properties of the low-mass state, is, however, also not incompatible with data.

中文翻译：

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Hyperon III：$$ K ^ {-} p-\ pi \ varSigma $$ K-p-πΣ在$$ \ varLambda（1405）$$Λ（1405）质量区域中的耦合通道动力学

来自JLab的CLAS的\（\ gamma p \ rightarrow K ^ +（\ varSigma \ pi）\）中三个电荷状态的低能量数据，位于\（K ^ -p \ rightarrow \ pi ^ 0 \ pi ^ 0来自BNL水晶球的\ varLambda \）和\（\ pi ^ 0 \ pi ^ 0 \ varSigma \），气泡室数据位于\（K ^ -p \ rightarrow \ pi ^-\ pi ^ + \ pi ^ { \ pm} \ varSigma ^ {\ mp} \），\（K ^-\）诱导的反应的低能总截面以及\（K ^ -p \）原子的数据均与BnGa部分-波分析程序。我们发现，仅用一个等量自旋1/2负奇偶极，\（\ varLambda（1405）\）和背景贡献就可以很好地拟合数据。在一个等时状态下，可以将\（\ varLambda（1405）\）结构确定为主要的SU（3）单重态。但是，具有两个等量单重态的拟合以及具有低质量态的强制属性也与数据不兼容。