Bulletin of the American Physical Society
85th Annual Meeting of the APS Southeastern Section
Volume 63, Number 19
Thursday–Saturday, November 8–10, 2018; Holiday Inn at World’s Fair Park, Knoxville, Tennessee
Session G04: Nuclear Physics II
2:00 PM–3:12 PM,
Friday, November 9, 2018
Holiday Inn Knoxville Downtown
Room: Parlor
Chair: Grant Riley, University of Tennessee, Knoxville
Abstract ID: BAPS.2018.SES.G04.3
Abstract: G04.00003 : Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory*
2:24 PM–2:36 PM
Presenter:
Douglas W Higinbotham
(Jefferson Lab)
Authors:
Jose Alarcón
(Universidad Complutense de Madrid)
Douglas W Higinbotham
(Jefferson Lab)
Christian Weiss
(Jefferson Lab)
Zhihong Ye
(Argonne National Laboratory)
In electron scattering, the proton radius is determined by determining the slope of the charge form factor at a Q2 of zero. Typically this requires extrapolating fits of the experimental data and will give different radii depending on the function used. I will present a radius extraction using a novel theoretical framework based on analyticity and first-principles dynamical input from chiral EFT (dispersively improved chiral EFT, DIchEFT). The spacelike form factor data are compared with the DIchEFT predictions for various fixed radii, and the physical radius is determined by the best match between theory and experiment up to Q2 ~ 0.5 GeV2. We obtain a radius of 0.844(7) fm, in agreement with the high-precision muonic hydrogen results.
*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contracts DE-AC05-06OR23177 and DE-AC02-06CH11357. J.M.A. acknowledges support from the Community of Madrid through the Programa de atracción de talento investigador 2017 (Modalidad 1), the Spanish MECD grants FPA2016-77313-P, FPA2016-75654-C2-2-P and the group UPARCOS.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.SES.G04.3
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