A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.
Precision Rosenbluth measurement of the proton elastic form factors
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abstract
We report the results of a new Rosenbluth measurement of the proton form factors at Q^2 values of 2.64, 3.20 and 4.10 GeV^2. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q^2, relative cross sections were determined to better than 1%. The measurement focussed on the extraction of G_E/G_M which was determined to 4-8% and found to approximate form factor scaling, i.e. \mu_p G_E \approx G_M. These results are consistent with and much more precise than previous Rosenbluth extractions. However, they are inconsistent with recent polarization transfer measurements of comparable precision, implying a systematic difference between the two techniques.
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Electromagnetic nucleon form factors in the extended vector meson dominance model
A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.