论文标题
$σ^{+} $和$σ^{ - } $的电磁形式因素
Electromagnetic form factors of $Σ^{+}$ and $Σ^{-}$ in the vector meson dominance model
论文作者
论文摘要
基于$ e^{+} e^{ - } \ toσ^{+} \barς^{ - } $和$ e^{+^{+} e^{ - } \ tσ^{ - } \barς\barς^{+process $ hypermagnect of Electomagne $ =+=通过使用媒介中的优势模型进行研究。我们包括了$ρ$，$ω$和$ ϕ $梅森的贡献。该模型参数由BESIII实验数据确定，$ | g _ {\ rm eff} | $ formelike有效形式$ | g _ {\ rm eff} | $ of $σ^{+} $和$σ^{ - } $从2.3864到3.02 GEV。然后，我们通过分析地将电磁形式归因于间距区域，并评估$σ^+$和$σ^ - $的间距类型颜色。 $σ^+$和$σ^ - $ baryons获得的电磁形式因子与其他模型计算相当。
Based on the recently measurements of the $e^{+} e^{-} \to Σ^{+} \barΣ^{-}$ and $e^{+} e^{-} \to Σ^{-} \barΣ^{+}$ processes, the electromagnetic form factors of the hyperon $Σ^+$ and $Σ^-$ in the timelike region are investigate by using the vector meson dominance model. We have included the contributions from the $ρ$, $ω$ and $ϕ$ mesons. The model parameters are determined with the BESIII experimental data on the timelike effective form factors $|G_{\rm eff}|$ of $Σ^{+}$ and $Σ^{-}$ for center-of-mass energy from 2.3864 to 3.02 GeV. Then, we analytically continue the electromagnetic form factors to spacelike region and evaluate the spacelike form factors of $Σ^+$ and $Σ^-$. The obtained electromagnetic form factors of the $Σ^+$ and $Σ^-$ baryons are comparable with other model calculations.
