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Generalized parton distributions from nucleon form factor data

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Abstract.

We present a simple empirical parameterization of the x- and t-dependence of generalized parton distributions at zero skewness, using forward parton distributions as input. A fit to experimental data for the Dirac, Pauli and axial form factors of the nucleon allows us to discuss quantitatively the interplay between longitudinal and transverse partonic degrees of freedom in the nucleon (“nucleon tomography”). In particular we obtain the transverse distribution of valence quarks at given momentum fraction x. We calculate various moments of the distributions, including the form factors that appear in the handbag approximation to wide-angle Compton scattering. This allows us to estimate the minimal momentum transfer required for reliable predictions in that approach to be around \(\vert t\vert \simeq 3 {\rm GeV}^2\). We also evaluate the valence contributions to the energy-momentum form factors entering Ji’s sum rule.

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Received: 16 September 2004, Revised: 15 October 2004, Published online: 17 December 2004

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Diehl, M., Feldmann, T., Jakob, R. et al. Generalized parton distributions from nucleon form factor data. Eur. Phys. J. C 39, 1–39 (2005). https://doi.org/10.1140/epjc/s2004-02063-4

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