The question of whether the electron has a substructure of any sort must be decided by experiment. All experiments to date agree with the Standard Model of the electron, with no substructure, ring-like or otherwise. The two major approaches are high-energy electron–positron scattering and high-precision atomic tests of quantum electrodynamics, both of which agree that the electron is point-like at resolutions down to 10 m. At present, the Compton region of virtual processes, 10 cm across, is not exhibited in the high-energy experiments on electron–positron scattering.