Generalized Parton Distrbutions and Nucleon Form Factors

TL;DR

This paper models proton and neutron form factors using generalized parton distributions, successfully fitting experimental data by adjusting the GPD slope, especially improving neutron form factor descriptions with polarization transfer data.

Contribution

It introduces a simple momentum transfer dependence in GPDs to accurately describe nucleon form factors across different experimental datasets.

Findings

Both Rosenbluth and polarization transfer data are fitted by tuning GPD E slope.

Neutron form factors are better described using polarization transfer data.

The model provides a unified description of nucleon form factors.

Abstract

The Dirac and Pauli form factors of the proton and neutron are obtained in the framework of the generalized parton distributions (GPDs) with some simple momentum transfer dependence. It is shown that both sets of the existing experimental data of the form factors, obtained by the Rosenbluth and polarization transfer, can be described by changing only the slope of the GPDs $E$. The description of neutron form factors is substantially better when the proton data obtained by the studies of polarization transfer are used.