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Dispersion-Theoretical Analysis of the Nucleon Electromagnetic Formfactors
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abstract
Dispersion relations allow for a coherent description of the nucleon electromagnetic form factors measured over a large range of momentum transfer, $Q^2 \simeq 0 \ldots 35$ GeV$^2$. Including constraints from unitarity and perturbative QCD, we present a novel parametrisation of the absorptive parts of the various isoscalar and isovector nucleon form factors. Using the current world data, we obtain results for the electromagnetic form factors, nucleon radii and meson couplings. We stress the importance of measurements at large momentum transfer to test the predictions of perturbative QCD.
Forward citations
Cited by 2 Pith papers
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Top-quark Partial Compositeness beyond the effective field theory paradigm
In a simplified partial-compositeness model, energy-dependent gluon form factors suppress heavy top partner production by up to an order of magnitude and add a few-percent distortion to quark-initiated top pair production.
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Baryon Form Factors
A review of baryon form factors summarizing the authors' dispersion-theoretical fits, which yield r_p^E = 0.840 fm, r_p^M = 0.849 fm, and r_n^M = 0.864 fm.
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