Model-independent extraction of the proton charge radius from electron scattering

Constraints from analyticity are combined with experimental electron-proton scattering data to determine the proton charge radius. In contrast to previous determinations, we provide a systematic procedure for analyzing arbitrary data without model-dependent assumptions on the form-factor shape. We also investigate the impact of including electron-neutron scattering data, and data. Using representative data sets we find r₄^p=0. 8700. 0230. 012 fm using just proton scattering data; r₄^p=0. 880-₀. ₀₂₀^+0. 0170. 007 fm adding neutron data; and r₄^p=0. 8710. 0090. 0020. 002 fm adding data. The analysis can be readily extended to other nucleon form factors and derived observables.