Proton Electromagnetic Form Factor Ratios at Low Q^2

Details Proton Electromagnetic Form Factor Ratios at Low Q^2 Proton Electromagnetic Form Factor Ratios at Low Q^2

2007-11-06

arxiv.org/abs/0711.0972v3

Phys.Rev.Lett.101:082002,2008

Physics

Nuclear Physics

Nuclear Theory

4 pages 3 figures We have corrected references, figures and some typographical errors

Scientific paper

10.1103/PhysRevLett.101.082002

We study the ratio $R\equiv\mu G_E(Q^2)/G_M(Q^2)$ of the proton at very small values of $Q^2$. Radii commonly associated with these form factors are not moments of charge or magnetization densities. We show that the form factor $F_2$ 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. We find that existing measurements show that the magnetization density extends further than the charge density, in contrast with expectations based on the measured reduction of $R$ as $Q^2$ increases.

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