Proton Electromagnetic-Form-Factor Ratios at LowQ2

2007/11/16 by Gerald A. Miller, Eli Piasetzky, E. Piasetzky +1 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevlett.101.082002

published as Phys.Rev.Lett.101:082002,2008 · 4 pages 3 figures We have corrected references, figures and some typographical errors

arxiv created 2007/11/16 · openalex publication_date 2008/08/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We study the ratio R identical with muG_E(Q2)/G_M(Q2) of the proton at very small values of Q2. Radii commonly associated with these form factors are not moments of charge or magnetization densities. We show that the form factor F2 is correctly interpretable as the two-dimensional Fourier transformation of a magnetization density. A relationship between the measurable ratio and moments of true charge and magnetization densities is derived and used to show that the magnetization density extends further than the charge density, in contrast with expectations based on the measured reduction of R as Q2 increases.

Citations

• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Impact parameter dependent parton distributions and transverse single spin asymmetries
• Nucleon form factors and a nonpointlike diquark
• Empirical Transverse Charge Densities in the Nucleon and the Nucleon-to-ΔTransition

Cited by

• A concept for the experimental determination of the nucleon electric to magnetic form factor ratio at very lowQ2
• Timelike virtual compton scattering from electron-positron radiative annihilation