Fresh Extraction of the Proton Charge Radius from Electron Scattering

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 su...

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Bibliographic Details
Published in:Physical review letters 2021-08, Vol.127 (9), p.092001-092001, Article 092001
Main Authors: Cui, Zhu-Fang, Binosi, Daniele, Roberts, Craig D., Schmidt, Sebastian M.
Format: Article
Language:English
Subjects:
Deuterium
Elastic scattering
Interpolation
Protons
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Summary: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 Q2 ≃ 0. Applying the method to extant modern e p datasets, we find that all results are mutually consistent and, combining them, we arrive at rp = 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.092001