Overview on the theory and phenomenology of generalized parton distributions

TL;DR

This paper provides an overview of the theoretical framework and experimental phenomenology of generalized parton distributions (GPDs), emphasizing methods for extracting GPDs from experiments and their significance for understanding hadron structure.

Contribution

It introduces the recent framework of single-diffractive hard exclusive processes for linking GPDs to experimental data and discusses challenges in extracting GPDs' x-dependence.

Findings

Discusses the matching of GPDs to experimental observables

Highlights challenges in separating different GPDs

Explores potential solutions for GPD extraction

Abstract

We give a brief overview on the theory and phenomenology of generalized parton distributions (GPDs), including the recently developed framework of single-diffractive hard exclusive process for matching GPDs to experimental observables. We concentrate on the extraction of GPDs from experimental processes, especially on the challenges and potential solutions regarding the separation of different GPDs and the extraction of $x$-dependence of GPDs, which is critically important for constructing the tomographic images and matching the $x$-moments of GPDs to various emergent hadron properties.