Unbiased determination of DVCS Compton Form Factors
Résumé
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.
Mots clés
12.38.-t
13.60.Fz
14.20.-c
13.60.-r
3D Nucleon Structure
Nucleon Tomography
Global Fit
Deeply Virtual Compton Scattering
DVCS
Compton Form Factor
CFF
Dispersion Relation
Subtraction Constant
Generalized Parton Distribution
Artificial Neural Network
GPD
Genetic Algorithm
EIC
Jefferson Lab
PARTONS Framework
Compton scattering: form factor
deeply virtual Compton scattering
neural network
generalized parton distribution
dispersion relation
regularization
data analysis method
statistical analysis
parametrization