Time-like electromagnetic form factors of $\Lambda ,\Sigma$ and ${\Xi }^{+}$ in a light-front quark model

Abstract

We use the light front quark model to investigate the form factors in the $e^{+}{e}^{-}\to B\bar{B}$ collision proceses with $B=\Lambda ,\Sigma$ and $\Xi$. These form factor behaviors are calculated based on the Bethe-Salpeter formalism with $q^{+}>0$ to effectively account for non-valence contributions. We show that our results of the $q^2$-dependent form factors closely match the BESIII data. In particalar, we obtain that $|G_{eff}|=(0.921,0.098,0.189$) and $R=|$$\frac{G_E}{G_M}$$|=(0.97,0.89$,~$0.936$) for $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$,~${\Sigma }^{+}{\Sigma }^{-},{\Xi }^{+}{\Xi }^{+})$ which $q^2=(5.74,6.0,7.0)$ GeV${}^2$.

Comments: 12 pages, 2 figures