Dispersion-theoretical analysis of the electromagnetic form factors of the $$\Lambda $$ hyperon

The electromagnetic form factors of the $\Lambda$ hyperon in time-like region are determined precisely through a dispersion-theoretical analysis world data for cross section annihilation process $e^+e^-\to \bar{\Lambda}{\Lambda}$. spectral function is represented by superposition narrow and broad vector meson poles. We test different scenarios obtain good description region. uncertainties extracted estimated means bootstrap sampling method. analytical continuation to space-like introduces large errors due lack data. When electric radius from chiral perturbation theory taken as constraint, magnetic predicted $r_M = 0.681 \pm 0.002$ fm. also extract various baryon coupling constants.