RT Journal Article
T1 Precise determination of the proton magnetic radius from electron scattering data
A1 Alarcón, Jose Manuel
A1 Higinbotham, D. W.
A1 Weiss, C.
AB We extract the proton magnetic radius from high-precision electron-proton elastic scattering cross section data. Our theoretical framework combines dispersion analysis and chiral effective field theory and implements the dynamics governing the shape of the low- Q 2 form factors. It allows us to use data up to Q 2 ≈ 0.5 GeV 2 for constraining the radii and overcomes the difficulties of empirical fits and Q 2 → 0 extrapolation. We obtain a magnetic radius r p M = 0.850 ± 0.001 ( 1 σ fit uncertainty) + 0.009 − 0.004 (full-range theory uncertainty) fm, significantly different from earlier results obtained from the same data using empirical fits, and close to our extracted electric radius r p E = 0.842 ± 0.002 ( 1 σ fit uncertainty) + 0.005 − 0.002 (full-range theory uncertainty) fm.
PB APS Physics
SN 2469-9985
YR 2020
FD 2020-09-21
LK https://hdl.handle.net/20.500.14352/7263
UL https://hdl.handle.net/20.500.14352/7263
LA eng
NO Comunidad de Madrid/MECD
NO U.S. Department of Energy, Office of Science, Office of Nuclear Physics
DS Docta Complutense
RD 3 may 2024