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arXiv · 2509.08037

GUMP1.0 -- First global extraction of generalized parton distributions from experiment and lattice data with NLO accuracy

Yuxun Guo·Fatma P. Aslan·Xiangdong Ji·M. Gabriel Santiago
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Abstract

We report the first global extraction of generalized parton distributions (GPDs), GUMP1.0, by combining deeply virtual Compton scattering and $\rho$-meson production data from Jefferson Lab and Hadron-Electron Ring Accelerator with global fits of parton distribution functions, charge form factors, and lattice quantum chromodynamics simulations. Using a conformal moment space parametrization, we achieve a unified description across low- and high-$x$ regions at next to leading order (NLO) accuracy in perturbative corrections. The results provide state-of-the-art GPDs consistent with almost all known facts, enabling three-dimensional nucleon imaging in impact parameter space and, at the same time, establishing a benchmark for future theoretical and experimental studies of the nucleon structure.

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Yuxun Guo, Fatma P. Aslan, Xiangdong Ji, M. Gabriel Santiago. 2025-09-09. GUMP1.0 -- First global extraction of generalized parton distributions from experiment and lattice data with NLO accuracy. https://arxiv.org/abs/2509.08037

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