Аңдатпа
The electron excitation of nucleon resonances is discussed both from the theoretical and from the experimental point of view. This discussion is based on a phenomenological approach that employs the conservation of the electromagnetic and vector-meson hadronic currents and the requirements of limiting chiral invariance. For the electron excitation of J π =1/2 ± ,3/2 ± ,5/2 ± ,... nucleon resonances, the structure functions are defined in terms of Sachs transition form factors. The resulting resonance structure functions for l + N → l + R processes are used in parametrizing smooth (background) structure functions for l + N → l + X inelastic scattering.