论文标题
超子电磁形式在时型区域中
Hyperon electromagnetic form factors in the timelike region
论文作者
论文摘要
研究了及时区域中超子（$λ$，$σ$，$ξ$）的电磁形式，可在反应中访问$ e^+e^ - \ to \ bar yy $。重点放在接近反应阈值的能量上，其中这些形式的特性受到最终$ \ bar yy $系统相互作用的显着影响。在计算中考虑了这种相互作用，利用了JülichGroup构建的$ \ yy $潜在模型，用于分析过去从反应$ \ bar pp \ to \ bar yy $的数据分析。在$ e^+e^ - \ to \barλλ$和$ e^+e^ - \ to \barσ^0λ$的实验中看到的有效外形的增强。关于反应，$ e^+e^ - \ to \barσ^ - σ^+，\ \ \barς^0σ^0，\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ =+σ^ - $在低能量的结果中观察到三个通道之间的微妙相互作用，这是由$ \barσς$互动引起的。电磁形式因素的预测$ g_m $和$ g_e $在及时区域中的预测以$λ$，$σ$和$ξ$ hyperons的形式提出。
Electromagnetic form factors of hyperons ($Λ$, $Σ$, $Ξ$) in the timelike region, accessible in the reaction $e^+e^- \to \bar YY$, are studied. The focus is on energies close to the reaction thresholds, where the properties of these form factors are significantly influenced by the interaction in the final $\bar YY$ system. This interaction is taken into account in the calculation, utilizing $\bar YY$ potential models that have been constructed by the Jülich group for the analysis of data from the reaction $\bar pp \to \bar YY$ in the past. The enhancement of the effective form factor for energies close to the threshold, seen in experiments of $e^+e^- \to \bar ΛΛ$ and $e^+e^- \to \bar Σ^0Λ$, is reproduced. With regard to the reactions $e^+e^- \to \bar Σ^- Σ^+, \ \barΣ^0Σ^0, \ \barΣ^+Σ^-$ a delicate interplay between the three channels is observed in the results at low energies, caused by the $\barΣΣ$ interaction. Predictions for the electromagnetic form factors $G_M$ and $G_E$ in the timelike region are presented for the $Λ$, $Σ$, and $Ξ$ hyperons.
