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Published on: May 3, 2019
Fresh Extraction of the Proton Charge Radius from Electron Scattering
Zhu-Fang Cui1,2, Daniele Binosi3, Craig D Roberts1,2
1School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China.
Abstract:
We present a novel method for extracting the proton radius from elastic electron-proton (ep) scattering data. The approach is based on interpolation via continued fractions augmented by statistical sampling and avoids any assumptions on the form of function used for the representation of data and subsequent extrapolation onto Q^{2}≃0. Applying the method to extant modern ep datasets, we find that all results are mutually consistent and, combining them, we arrive at r_{p}=0.847(8) fm. This result compares favorably with values obtained from contemporary measurements of the Lamb shift in muonic hydrogen, transitions in electronic hydrogen, and muonic deuterium spectroscopy.
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