From QCD-Based Descriptions to Direct Fits: A Unified Study of Nucleon Electromagnetic Form Factors

TL;DR

This paper develops a comprehensive framework combining GPD contributions and vector-meson exchange to accurately model nucleon electromagnetic form factors across various momentum transfers.

Contribution

It introduces a unified approach that integrates multiple theoretical models and fits experimental data to produce stable, analytic parametrizations of nucleon form factors.

Findings

Achieved accurate fits to experimental data for proton and neutron form factors.

Constructed stable Padé-based parametrizations over a wide momentum transfer range.

Provided a physically motivated description of nucleon structure.

Abstract

We present a detailed study of the nucleon electromagnetic form factors in the spacelike region by combining three complementary approaches: two GPD-based contributions and a vector-meson exchange component. By fitting experimental data, we extract the optimal weights and shape parameters describing the proton and neutron form factors. Global Pad\'e-based fits are then constructed for four distinct groups of form factors, starting from local Taylor expansions and yielding stable analytic parametrizations over the analyzed $t$ range. The combined framework provides an accurate and physically motivated description of nucleon structure within a controlled model-dependent setting across a wide range of momentum transfers.