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.
Authors / Affiliations: mappings to Contributors and OrganizationsSee all Organizations.
- 1 Université Paris-Saclay / University of Paris-Saclay
- 2 Narodowe Centrum Badań Jądrowych / National Centre for Nuclear Research [NCBJ]
- Horizon 2020 (through Organization: European Commission [EC])
- Institut National de Physique Nucléaire et de Physique des Particules [IN2P3]
- Narodowe Centrum Nauki / National Science Center [NCN]