Speaker
Description
Today, many nucleon resonances are known and more are being discovered. They are the most fundamental three-body systems in Nature. Working with a Poincare-covariant quark+diquark, q(qq), Faddeev equation approach to nucleon and its resonance structure, a refined symmetry preserving current is developed. The parameters in the interaction current are chosen to ensure that the q(qq) picture reproduces selected results from contemporary 3-body analyses of nucleon elastic electromagnetic form factors. Although the subset of fitted results is small, the q(qq) picture reproduces almost all the 3-body predictions and often results in better agreement with available data. Using this refined symmetry preserving current to study ∆(1700)3/2− electroproduction form factors, the predictions agree well with experimental data on x ≳ 2.