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Shadow generalized parton distributions: a practical approach to the deconvolution problem of DVCS

by V. Bertone, H. Dutrieux, C. Mezrag, H. Moutarde, P. Sznajder

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Submission summary

Authors (as registered SciPost users): Hervé Dutrieux
Submission information
Preprint Link:  (pdf)
Date accepted: 2022-03-22
Date submitted: 2021-07-26 10:55
Submitted by: Dutrieux, Hervé
Submitted to: SciPost Physics Proceedings
Proceedings issue: 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Experiment
  • High-Energy Physics - Phenomenology
  • Nuclear Physics - Experiment
Approaches: Experimental, Phenomenological


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.

Published as SciPost Phys. Proc. 8, 107 (2022)

Submission & Refereeing History

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Submission 2107.11312v1 on 26 July 2021

Reports on this Submission

Anonymous Report 1 on 2022-3-16 (Invited Report)


Very nice result and report recommend for publication.

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