V. Bertone, H. Dutrieux, C. Mezrag, H. Moutarde, P. Sznajder
SciPost Phys. Proc. 8, 107 (2022) ·
published 13 July 2022
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Deeply virtual Compton scattering (DVCS) attracts a lot of interest due to
its sensitivity to generalized parton distributions (GPDs) which provide a rich
access to the partonic structure of hadrons. However, the practical extraction
of GPDs for this channel requires a deconvolution procedure, whose feasibility
has been disputed. We provide a practical approach to this problem based on a
next-to-leading order analysis and a careful study of evolution effects, by
exhibiting shadow GPDs with arbitrarily small imprints on DVCS observables at
current and future experimental facilities. This shows that DVCS alone will not
allow for a model independent extraction of GPDs and a multi-channel analysis
is required for this purpose.
