Electromagnetic form factors of ${\Sigma }^{+}$ and ${\Sigma }^{-}$ in the vector meson dominance model

Abstract

Based on the recently measurements of the $e^{+}{e}^{-}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$ and $e^{+}{e}^{-}\to {\Sigma }^{-}{\bar{\Sigma }}^{+}$ processes, the electromagnetic form factors of the hyperon ${\Sigma }^{+}$ and ${\Sigma }^{-}$ in the timelike region are investigate by using the vector meson dominance model. We have included the contributions from the $\rho$, $\omega$ and $\varphi$ mesons. The model parameters are determined with the BESIII experimental data on the timelike effective form factors $|G_{\mathrm{eff}}|$ of ${\Sigma }^{+}$ and ${\Sigma }^{-}$ 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 ${\Sigma }^{+}$ and ${\Sigma }^{-}$. The obtained electromagnetic form factors of the ${\Sigma }^{+}$ and ${\Sigma }^{-}$ baryons are comparable with other model calculations.

Comments: 5 pages, 5 figures.Accepted for publication in communications in theoretical physics