Flavor Analysis of Nucleon, Δ, and Hyperon Electromagnetic Form Factors

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 Q² ∼ 4 GeV², relying on three-quark configurations only. Analogous studies have been extended to the Δ and the hyperon electromagnetic form factors. For them we here show only some sample results in comparison to data from lattice quantum chromodynamics. (author)