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arxiv: 1505.02680 · v1 · pith:FLZQVRBNnew · submitted 2015-05-11 · ⚛️ nucl-ex · hep-ph· nucl-th· physics.atom-ph

Evaluation of the proton charge radius from e-p scattering

classification ⚛️ nucl-ex hep-phnucl-thphysics.atom-ph
keywords radiuschargeprotonscatteringmeasurementsdatadifferenthydrogen
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In light of the proton radius puzzle, the discrepancy between measurements of the proton charge radius from muonic hydrogen and those from electronic hydrogen and electron-proton scattering measurements, we reexamine the charge radius extractions from electron scattering measurements. We provide a recommended value for the proton RMS charge radius, $r_E = 0.879 \pm 0.011$ fm, based on a global examination of elastic e-p scattering data. The uncertainties include contributions to account for tension between different data sets and inconsistencies between radii using different extraction procedures.

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  1. Electromagnetic form factors of the nucleon from the instanton vacuum

    hep-ph 2026-05 unverdicted novelty 5.0

    Nucleon EM form factors computed in instanton vacuum model with parameters fixed by saddle-point equation yield proton charge radius 0.841 fm matching muonic hydrogen and good agreement on Q2 dependence of ratios.