Publications
Publication Information
| Title | Accurate nucleon electromagnetic form factors from dispersively improved chiral effective field theory |
| Authors | Jose Manuel Alarcon, Christian Weiss |
| JLAB number | JLAB-THY-18-2675 |
| LANL number | arXiv:1803.09748 |
| Other number | DOE/OR/23177-4402 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
| Other Funding: | MINECO and FEDER, FPA2016-77313-P |
|
Journal Compiled for Physics Letters B Volume 784 Page(s) 373-377 Refereed | |
| Publication Abstract: | We present a theoretical parametrization of the nucleon electromagnetic form factors (FFs) based on a combination of chiral effective ?field theory and dispersion analysis. The isovector spectral functions on the two-pion cut are computed using elastic unitarity, chiral pion-nucleon amplitudes, and timelike pion FF data. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fi?xed by sum rules (charges, radii). Excellent agreement with the spacelike proton and neutron FF data is achieved up to Q^2 ~ 1 GeV^2. Our parametrization provides proper analyticity and theoretical uncertainty estimates and can be used for low-Q^2 FF studies and proton radius extraction. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1016/j.physletb.2018.07.060 |
| Accepted Manuscript: | 1-s2.0-S0370269318306154-main.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |