Inelastic Electron Scattering from Protons

Abstract

A large body of data is presented on inelastic electron scattering at energies up to 1.1 GeV. Only the scattered electrons were detected. Part of the measurements were made at fixed momentum transfer and fixed scattered electron energy over a region of energy loss concentrating on the first pion-nucleon resonance. The other measurements were made at fixed momentum transfer and fixed equivalent photon energy in the region of the first resonance, varying the scattered electron energy. The transverse part ${\ensuremath{\sigma}}_{t}$ is found to be dominant, but the longitudinal part ${\ensuremath{\sigma}}_{s}$ is nonzero at the first resonance. The results suggest that the proton and first resonance share a common magnetic form factor.