Strategies to Extract Generalized Parton Distributions from Data

TL;DR

This paper proposes a comprehensive strategy for extracting Generalized Parton Distributions from experimental data, integrating constraints from elastic, inclusive scattering, and lattice QCD to address the complexity of the analysis.

Contribution

It introduces a novel method combining experimental and theoretical constraints to improve GPD extraction from deeply virtual exclusive experiments.

Findings

Effective extraction of GPDs using combined constraints.

Reduction in uncertainties of GPDs through the proposed strategy.

Enhanced understanding of quark momentum distributions in nucleons.

Abstract

A number of deeply virtual exclusive experiments will allow us to access the Generalized Parton Distributions which are embedded in the complex amplitudes for such processes. The extraction from experiment is particularly challenging both because of the large number of kinematical variables and observables to be pinned down in each experimental analysis and because, at variance with inclusive experiments, the variables representing the quark momentum fraction appear integrated over in the physical amplitudes and cannot be accessed directly. We present a strategy for the extraction from experiment that makes use of constraints from both elastic and inclusive scattering as well as information from lattice QCD results.