skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3]
  1. Univ. Complutense de Madrid, Madrid (Spain)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab.(ANL), Lemont, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1505247
Alternate Identifier(s):
OSTI ID: 1505160; OSTI ID: 1506417
Report Number(s):
JLAB-THY-18-2804; arXiv:1809.06373; DOE/OR/23177-4544
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:  
AC05-06OR23177; AC02-06CH11357; FPA2016-77313-P; FPA2016-75654-C2-2-P
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 99; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Alarcon, Jose Manuel, Higinbotham, Douglas W., Weiss, Christian, and Ye, Zhihong. Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.99.044303.
Alarcon, Jose Manuel, Higinbotham, Douglas W., Weiss, Christian, & Ye, Zhihong. Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory. United States. doi:10.1103/PhysRevC.99.044303.
Alarcon, Jose Manuel, Higinbotham, Douglas W., Weiss, Christian, and Ye, Zhihong. Fri . "Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory". United States. doi:10.1103/PhysRevC.99.044303.
@article{osti_1505247,
title = {Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory},
author = {Alarcon, Jose Manuel and Higinbotham, Douglas W. and Weiss, Christian and Ye, Zhihong},
abstractNote = {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.},
doi = {10.1103/PhysRevC.99.044303},
journal = {Physical Review C},
issn = {2469-9985},
number = 4,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.99.044303

Save / Share: