Orateur
Description
Generalized Parton Distributions (GPD) are multidimensonal structure functions that encode the information about the internal structure of hadrons. Using privileged channels such as Deeply Virtual Compton Scattering (DVCS) or Timelike Compton Scattering (TCS), it is possible to make direct measurements at points where the momentum fraction of the parton equals the respective scaling variable. Double Deeply Virtual Compton Scattering (DDVCS) is a not yet measured promising channel for GPD studies as it allows to perform more general GPD measurements at independent momentum fraction and scaling variable values.
GPD values are extracted from Compton Form Factors which arise naturally in experimental observables built from different combinations of beam and target configurations. In the context of the Continuous Electron Beam Accelerator Facility (CEBAF) and the Electron Ion Collider (EIC), we report the results of an exhaustive study of the DDVCS observables built from polarized electron and positron beams directed to a polarized proton target. The study is focused on the sensitivity of the observables to the parton helicity conserving (chiral-even) proton GPDs. In particular, we focus on the consequences for GPDs measurements via DDVCS at CEBAF and EIC based on the VGG and GK19 model predictions
