An examination of proton charge radius extractions from e-p scattering data

Understand

A detailed examination of issues associated with proton radius extractions from elastic electron-proton scattering experiments is presented.

• Sources of systematic uncertainty and model dependence in the extractions are discussed, with an emphasis on how these may impact the proton charge and magnetic radii.
• A comparison of recent Mainz data to previous world data is presented, highlighting the difference in treatment of systematic uncertainties as well as tension between different data sets.
• We find several issues that suggest that larger uncertainties than previously quoted may be appropriate, but do not find any corrections which would resolve the proton radius puzzle.