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arXiv · 2610.23390

Neural Network Representation of Generalized Parton Distributions (NNGPD)

Simonetta Liuti·Jitao Xu·Ho Jang·Zaki Panjsheeri·Gia-Wei Chern·Yaohang Li·Douglas Q. Adams·Michael Engelhardt·Gary R. Goldstein·Adil Khawaja·Huey-Wen Lin·Saraswati Pandey·Kemal Tezgin
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Abstract

Extracting generalized parton distributions (GPDs) from experimental observables, the convolution structures denoted as Compton form factors (CFFs), requires solving an intrinsic inverse problem. We presented results using NNGPD, a flexible regression method based on a physics-informed neural-network framework, for reconstructing GPDs using integral constraints -- including CFFs and Mellin moments -- and symmetry and endpoint constraints. The approach does not require pointwise training information on the underlying GPDs. Closure tests using pseudodata generated from a phenomenological model demonstrate the ability of the framework to reproduce the principal features of the underlying distributions across a range of kinematics. A Bayesian neural-network formulation is also introduced to address uncertainties associated with the reconstruction. Finally, we discussed a broader question in GPD phenomenology: whether the complete momentum-fraction dependence of GPDs is necessary to extract physical quantities such as partonic angular momentum. This motivates investigating approaches that infer Mellin moments directly from experimentally constrained CFFs, while quantifying the remaining ambiguities.

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Simonetta Liuti, Jitao Xu, Ho Jang, Zaki Panjsheeri, Gia-Wei Chern, Yaohang Li, Douglas Q. Adams, Michael Engelhardt, Gary R. Goldstein, Adil Khawaja, Huey-Wen Lin, Saraswati Pandey, Kemal Tezgin. 2026-10-16. Neural Network Representation of Generalized Parton Distributions (NNGPD). https://arxiv.org/abs/2610.23390

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