The electric and magnetic form factors of the proton
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The paper describes a precise measurement of electron scattering off the proton at momentum transfers of $0.003 \lesssim Q^2 \lesssim 1$\ GeV$^2$. The average point-to-point error of the cross sections in this experiment is $\sim$ 0.37%. These data are used for a coherent new analysis together with all world data of unpolarized and polarized electron scattering from the very smallest to the highest momentum transfers so far measured. The extracted electric and magnetic form factors provide new insight into their exact shape, deviating from the classical dipole form, and of structure on top of this gross shape. The data reaching very low $Q^2$ values are used for a new determination of the electric and magnetic radii. An empirical determination of the Two-Photon-Exchange (TPE) correction is presented. The implications of this correction on the radii and the question of a directly visible signal of the pion cloud are addressed.
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Forward citations
Cited by 6 Pith papers
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Sensitivity of the photon-induced processes to the proton radius
Fitting dilepton production data in pp collisions with a dipole form factor model yields Λ² = 0.465 ± 0.056 GeV² (rp = 1.002 ± 0.038 fm), showing sensitivity to proton radius at high masses and forward rapidities but ...
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