Unbiased determination of DVCS Compton form factors

H. Moutarde (IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, 91191, France) ; P. Sznajder (National Centre for Nuclear Research (NCBJ), Pasteura 7, Warsaw, 02-093, Poland) ; J. Wagner (National Centre for Nuclear Research (NCBJ), Pasteura 7, Warsaw, 02-093, Poland)

The extraction of Compton form factors (CFFs) in a global analysis of almost all deeply virtual Compton scattering (DVCS) proton data is presented. The extracted quantities are DVCS sub-amplitudes and the most basic observables which are unambiguously accessible from this process. The parameterizations of CFFs are constructed utilizing the artificial neural network technique allowing for an important reduction of model dependency. The analysis consists of such elements as feasibility studies, training of neural networks with the genetic algorithm and a careful regularization to avoid over-fitting. The propagation of experimental uncertainties to extracted quantities is done with the replica method. The resulting parameterizations of CFFs are used to determine the subtraction constant through dispersion relations. The analysis is done within the PARTONS framework.

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      "surname": "Wagner", 
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      "value": "The extraction of Compton form factors (CFFs) in a global analysis of almost all deeply virtual Compton scattering (DVCS) proton data is presented. The extracted quantities are DVCS sub-amplitudes and the most basic observables which are unambiguously accessible from this process. The parameterizations of CFFs are constructed utilizing the artificial neural network technique allowing for an important reduction of model dependency. The analysis consists of such elements as feasibility studies, training of neural networks with the genetic algorithm and a careful regularization to avoid over-fitting. The propagation of experimental uncertainties to extracted quantities is done with the replica method. The resulting parameterizations of CFFs are used to determine the subtraction constant through dispersion relations. The analysis is done within the PARTONS framework."
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Published on:
26 August 2019
Publisher:
Springer
Published in:
European Physical Journal C , Volume 79 (2019)
Issue 7
Pages 1-19
DOI:
https://doi.org/10.1140/epjc/s10052-019-7117-5
arXiv:
1905.02089
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: