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First Global Extraction of Generalized Parton Distributions from Experiment and Lattice Data with
Yuxun Guo1,2, Fatma P Aslan3, Xiangdong Ji4
1University of California, Physics Department, Berkeley, California 94720, USA.
Physical Review Letters
|January 20, 2026
Summary
The first global extraction of generalized parton distributions (GPDs) was achieved using GUMP 1.0. This breakthrough enables 3D nucleon imaging and sets a benchmark for future nucleon structure research.
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Chromodynamics
Background:
- Generalized Parton Distributions (GPDs) are crucial for understanding nucleon structure.
- Existing GPD models often lack global consistency and comprehensive data integration.
Purpose of the Study:
- To perform the first global extraction of GPDs, named GUMP 1.0.
- To develop a unified description of nucleon structure across different kinematic regions.
- To enable three-dimensional nucleon imaging in impact parameter space.
Main Methods:
- Combined deeply virtual Compton scattering and ρ-meson production data.
- Integrated global fits of parton distribution functions and charge form factors.
- Incorporated lattice quantum chromodynamics simulations.
- Utilized a conformal moment space parametrization with next-to-leading order perturbative corrections.
Main Results:
- Successfully extracted the GUMP 1.0 GPDs, representing a state-of-the-art model.
- Achieved a unified description across low- and high-x regions.
- Demonstrated consistency with a wide range of experimental and theoretical constraints.
Conclusions:
- The GUMP 1.0 extraction provides the most comprehensive GPDs to date.
- This work enables advanced 3D imaging of the nucleon.
- Establishes a new benchmark for theoretical and experimental investigations of nucleon structure.
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