Precise determination of the proton magnetic radius from electron scattering data
Abstract
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- form factors. It allows us to use data up to for constraining the radii and overcomes the difficulties of empirical fits and extrapolation. We obtain a magnetic radius ( fit uncertainty) (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 ( fit uncertainty) (full-range theory uncertainty) fm.
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); Spanish MECD
- OSTI Identifier:
- 1664508
- Alternate Identifier(s):
- OSTI ID: 1666368
- Report Number(s):
- JLAB-THY-20-3149; DOE/OR/23177-4926; arXiv:2002.05167
Journal ID: ISSN 2469-9985; PRVCAN; 035203
- Grant/Contract Number:
- AC05-06OR23177; FPA2016-77313-P
- Resource Type:
- Published Article
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Name: Physical Review C Journal Volume: 102 Journal Issue: 3; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Charge distributions; effective field theory; electroweak interactions in nuclear physics; Lepton induced nuclear reactions; photonuclear reactions; quantum electrodynamics; neutrons; protons; chiral symmetry; form factors; magnetic moment; nonperturbative methods
Citation Formats
Alarcón, J. M., Higinbotham, D. W., and Weiss, C. Precise determination of the proton magnetic radius from electron scattering data. United States: N. p., 2020.
Web. doi:10.1103/PhysRevC.102.035203.
Alarcón, J. M., Higinbotham, D. W., & Weiss, C. Precise determination of the proton magnetic radius from electron scattering data. United States. https://doi.org/10.1103/PhysRevC.102.035203
Alarcón, J. M., Higinbotham, D. W., and Weiss, C. Mon .
"Precise determination of the proton magnetic radius from electron scattering data". United States. https://doi.org/10.1103/PhysRevC.102.035203.
@article{osti_1664508,
title = {Precise determination of the proton magnetic radius from electron scattering data},
author = {Alarcón, J. M. and Higinbotham, D. W. and Weiss, C.},
abstractNote = {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-Q2 form factors. It allows us to use data up to Q2≈0.5GeV2 for constraining the radii and overcomes the difficulties of empirical fits and Q2→0 extrapolation. We obtain a magnetic radius rMp=0.850±0.001 (1σ fit uncertainty) -0.004+0.009 (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 rEp=0.842±0.002 (1σ fit uncertainty) -0.002+0.005 (full-range theory uncertainty) fm.},
doi = {10.1103/PhysRevC.102.035203},
journal = {Physical Review C},
number = 3,
volume = 102,
place = {United States},
year = {Mon Sep 21 00:00:00 EDT 2020},
month = {Mon Sep 21 00:00:00 EDT 2020}
}
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevC.102.035203
https://doi.org/10.1103/PhysRevC.102.035203
Other availability
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FIG. 1: Data: Mainz A1 electron-proton elastic scattering cross section data, with the normalization of the sets determined by our fit (in the higher energy bins, the plots show the data up to Q2 = 0.5 GeV2). Bands: Theoretical model (DIχEFT) with parameters ($r^{p}_{E}$ , $r^{p}_{M}$ ) obtained from ourmore »
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.