2026-06-29T02:13:46Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/128732023-08-04T02:32:22Zcom_20.500.14352_14col_20.500.14352_15

Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory Alarcón, Jose Manuel Higinbotham, D. W. Weiss, C. Ye, Zhihong Partículas Teoría de los quanta 2208 Nucleónica 2210.23 Teoría Cuántica 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. Ministerio de Ciencia e Innovación (MICINN) U.S. Department of Energy, Office of Science, Office of Nuclear Physics Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-17T12:44:24Z 2023-06-17T12:44:24Z 2019-04-05 journal article https://hdl.handle.net/20.500.14352/12873 2469-9985 10.1103/PhysRevC.99.044303 eng FPA2016-77313-P; FPA2016- 75654-C2-2-P DE-AC05-06OR23177 and DE-AC02-06CH11357 Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ open access application/pdf APS Physics