Speaker
Description
Deeply virtual Compton scattering (DVCS) is a particularly promising channel to extract generalized parton distributions (GPDs) allowing the study of the three-dimensional structure and the energy-momentum tensor of the nucleon. However, the access to GPDs from DVCS experimental data is complicated by the so-called deconvolution problem and the lack of precise data in some kinematic regions. The recent highlight on "shadow GPDs", that is GPDs with arbitrarily small imprint on DVCS observables in a next-to-leading order study even with evolution effects, gives interesting possibilities to quantify the extent of the deconvolution problem and suggest modelling procedures to propagate the associated theoretical uncertainty. We discuss their impact on the extraction of energy-momentum tensor form factors and some statistical procedures to assess the impact of future experimental setups.