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Paper detail

Sum Rules for Nucleon GPDs and Border Function Formulation

The newy developed approach to model nucleon generalized parton distributions (GPDs) H and E$ is based on two types of their representation in terms of double distributions. Within this approach, we re-consider the derivation of GPD sum rules that allow to use border functions H(x,x) and E(x,x) instead of full GPDs H(x,ξ) and E(x,ξ) in the integrals producing Compton form factors of deeply virtual Compton scattering. Using factorized DD Ansatz to model GPDs, we discuss the relation between the border functions and underlying parton densities. We find that a substantial contribution to H(x,x) border function comes from the extra term required by new DD representations and related to E(x,ξ) GPD.

preprint2013arXivOpen access
A. V. Radyushkin
hep-ph
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A. V. Radyushkin

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