Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory
- Univ. Complutense de Madrid, Madrid (Spain)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
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 Q2 with the derivative at Q2 = 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-Q2 FF data for constraining the radius (up to Q2 ≈ 0.5 GeV2 and larger) and avoids the difficulties arising in methods relying on the Q2 → 0 extrapolation. We obtain a radius of 0.844(7) fm, consistent with the high-precision muonic hydrogen results.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab.(ANL), Lemont, IL (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC05-06OR23177; AC02-06CH11357; FPA2016-77313-P; FPA2016-75654-C2-2-P
- OSTI ID:
- 1505247
- Alternate ID(s):
- OSTI ID: 1505160; OSTI ID: 1506417
- Report Number(s):
- JLAB-THY-18-2804; arXiv:1809.06373; DOE/OR/23177-4544; PRVCAN
- Journal Information:
- Physical Review C, Vol. 99, Issue 4; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A small proton charge radius from an electron–proton scattering experiment
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journal | November 2019 |
Hyperfine structure of P states in muonic ions of lithium, beryllium, and boron
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journal | December 2019 |
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