Flavor analysis of nucleon, $\Delta$, and hyperon electromagnetic form factors
Résumé
By the analysis of the world data base of elastic electron scattering on the proton and the neutron (for the latter, in fact, on$^2H$ and$^3He$ ) important experimental insights have recently been gained into the flavor compositions of nucleon electromagnetic form factors. We report on testing the Graz Goldstone-boson-exchange relativistic constituent-quark model in comparison to the flavor contents in low-energy nucleons, as revealed from electron-scattering phenomenology. It is found that a satisfactory agreement is achieved between theory and experiment for momentum transfers up to $Q^2\sim 4\hbox { GeV}^2$ , relying on three-quark configurations only. Analogous studies have been extended to the $\Delta $ and the hyperon electromagnetic form factors. For them we here show only some sample results in comparison to data from lattice quantum chromodynamics.