Extraction of Pion Unpolarized Quark Generalized Parton Distribution from Charge Form Factors
Data-driven extraction of pion GPDs from electromagnetic form factor and PDF data.
S. Puhan, S. Sharma, N. Kumar, and H. Dahiya
e-Print: 2604.11116 [hep-ph]
April 13, 2026
Abstract
We report a data-driven determination of the unpolarized quark generalized parton distributions (GPDs) of the pion at zero skewness (ξ = 0) via a global fit to experimental electromagnetic form factor and parton distribution function data. A flexible form factor parameterization is embedded into the GPD framework with collinear PDFs and a profile function encoding transverse dynamics. The resulting GPDs provide impact-parameter-space interpretations — revealing the spatial parton distributions of the lightest QCD bound state. The results provide essential input for future experiments including the EIC Sullivan process, JLab 12 GeV exclusive π+ electroproduction, COMPASS, and AMBER pion-beam experiments.
Summary
Data-driven extraction of pion GPDs at zero skewness from global fit to form factor and PDF data. Provides impact-parameter-space parton distributions and predictions for EIC, JLab, COMPASS, and AMBER.
Authors: S. Puhan, S. Sharma, N. Kumar, and H. Dahiya
Published in: e-Print: 2604.11116 [hep-ph]