Abstract
We present the first lattice-QCD result for the Zemach and Friar radii of the proton and neutron. Our calculation includes both quark-connected and -disconnected diagrams and assesses all sources of systematic uncertainties arising from excited-state contributions, finite-volume effects, and the continuum extrapolation. At the physical point, we obtain for the proton rZp=(1.013±0.010(stat)±0.012(syst)) fm and rFp=(1.301±0.012(stat)±0.014(syst)) fm. These numbers suggest small values of the Zemach and Friar radii of the proton but are compatible with most of the experimental studies. Published by the American Physical Society 2024
Published Version
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