Hyperon electromagnetic form factors in the timelike region

Electromagnetic form factors of hyperons ($\mathrm{\ensuremath{\Lambda}}$, $\mathrm{\ensuremath{\Sigma}}$, $\mathrm{\ensuremath{\Xi}}$) in the timelike region, accessible reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{Y}Y$, are studied. The focus is on energies close to thresholds, where properties these significantly influenced by interaction final $\overline{Y}Y$ system. This taken into account calculation, utilizing potential models that have been constructed J\"ulich group for analysis data from $\overline{p}p\ensuremath{\rightarrow}\overline{Y}Y$ past. enhancement effective factor threshold, seen experiments ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\overline{\mathrm{\ensuremath{\Lambda}}}\mathrm{\ensuremath{\Lambda}}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}\mathrm{\ensuremath{\Lambda}}$, reproduced. With regard reactions ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{\ensuremath{-}}{\mathrm{\ensuremath{\Sigma}}}^{+}$, ${\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}{\mathrm{\ensuremath{\Sigma}}}^{0}$, ${\overline{\mathrm{\ensuremath{\Sigma}}}}^{+}{\mathrm{\ensuremath{\Sigma}}}^{\ensuremath{-}}$ a delicate interplay between three channels observed results at low energies, caused $\overline{\mathrm{\ensuremath{\Sigma}}}\mathrm{\ensuremath{\Sigma}}$ interaction. Predictions electromagnetic ${G}_{M}$ ${G}_{E}$ region presented $\mathrm{\ensuremath{\Lambda}}$, $\mathrm{\ensuremath{\Xi}}$ hyperons.