The $\Sigma$ and $\Xi$ electromagnetic form factors in the extended vector meson dominance model

Abstract

We propose a phenomenological extended vector meson dominance model for the baryon electromagnetic structure, and it is found that the current experimental data on the $\Sigma$ and $\Xi$ electromagnetic form factors in the time-like region can be well described. Meanwhile, we can also reproduce the ratios of the total cross sections of reactions $e^{+}{e}^{-}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$, ${\Sigma }^0{\bar{\Sigma }}^0$, and ${\Sigma }^{-}{\bar{\Sigma }}^{+}$, which are $9.7\pm 1.3:3.3\pm 0.7:1$ at center-of-mass energies from $2.3864$ to $3.02$ GeV. We also analytically continue the expression of the form factors to space-like region and estimate the charge radii of the $\Sigma$ and $\Xi$ hyperons. The result for the ${\Sigma }^{-}$ is in agreement with the experimental date.

7 pages, 5 figures. Typos are fixed

References in corpus (13)

• Nucleon Electromagnetic Form Factors
• Dispersion analysis of the nucleon form factors including meson continua
• Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
• The electromagnetic form factors of the proton in the timelike region
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Unexpected features of e+e-->ppbar and e+e-->lambda-lambdabar cross sections near threshold
• Periodic interference structures in the time-like proton form factor
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Measurement of the cross section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ and observation of an excited $\Xi$ baryon
• Hyperon electromagnetic form factors in the timelike region
• Measurement of the neutron charge radius and the role of its constituents
• Proton Electromagnetic Form Factors in the Time-like Region through the Scan Technique
• Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

Cited by in corpus (1)

• Electromagnetic nucleon form factors in the extended vector meson dominance model