%0 Journal Article
%A Alarcón, Jose Manuel
%A Higinbotham, D. W.
%A Weiss, C.
%A Ye, Zhihong
%T Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory
%D 2019
%@ 2469-9985
%U https://hdl.handle.net/20.500.14352/12873
%X We extract the proton charge radius from the elastic form factor (FF) data using a novel theoretical framework combining chiral effective field theory and dispersion analysis. Complex analyticity in the momentum transfer correlates the behavior of the spacelike FF at finite Q 2 with the derivative at Q 2 = 0 . The FF calculated in the predictive theory contains the radius as a free parameter. We determine its value by comparing the predictions with a descriptive global fit of the spacelike FF data, taking into account the theoretical and experimental uncertainties. Our method allows us to use the finite- Q 2 FF data for constraining the radius (up to Q 2 ≈ 0.5 GeV 2 and larger) and avoids the difficulties arising in methods relying on the Q 2 → 0 extrapolation. We obtain a radius of 0.844(7) fm, consistent with the high-precision muonic hydrogen results.
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