Phenomenology with the PARTONS software of Generalized Parton Distribution models built from Light-Front Wave-functions

Abstract

We present a procedure aiming at extending to the full kinematic domain a Generalized Parton Distribution obtained from a finite order truncation in Fock space. This method allows to fulfill both polynomiality and positivity at the same time and can be applied to any given models of Light-front wave-functions. In particular, we illustrate this on a three-body truncated wavefunction of the chiral quark soliton model and show how a systematic phenomenology of GPD models based on LFWFs can be achieved with the help of the PARTONS framework, here using DVCS data. This paves the way for a unified phenomenology of GPDs and TMDs at the level of LFWFs, with the final goal of hadron tomography.

Measurement of unpolarized and polarized cross sections for deeply virtual Compton scattering on the proton at Jefferson Laboratory with CLAS

“…points. The KMSC model can be accessed on line from the PARTONS computing framework [45]. The spirit of this comparison is to show that the theoretical expectations are in fair agreement with the cross sections and cross-section differences extracted in this work.…”

“…In this section, we compare the experimental cross sections with the theoretical calculations from the Vanderhaeghen, Guichon, and Guidal (VGG) [7,11,[42][43][44] and Kroll, Moutarde, Sabatié, and Chouika (KMSC) [45][46][47] contribution is included and the parameter values are taken as b v and b s (which control the x-ξ correlation) are both equal to 1, and α (which controls the x-t dependence) is equal to 1.1.…”