Intrinsic Transverse Size Effect

TL;DR

This paper combines gluonic radiative corrections and confinement size effects to analyze the neutron magnetic form factor, finding models consistent with data at high momentum transfer but acknowledging possible significant higher-order effects.

Contribution

It introduces a combined approach of radiative corrections and confinement effects to study the neutron form factor, highlighting the impact of higher-order and higher-twist contributions.

Findings

Models align with data at high momentum transfer

Higher-order corrections may be significant

Higher-twist effects could be weaker than in protons

Abstract

Two recently proposed concepts to improve the perturbative calculation of exclusive amplitudes, gluonic radiative corrections (Sudakov factor) and confinement size effects (intrinsic transverse momentum) are combined to study the neutron magnetic form factor in the space-like region. We find that nucleon distribution amplitudes modelled on the basis of current QCD sum rules indicate overlap with the existing data at the highest measured values of momentum transfer. However, sizeable higher-order perturbative corrections (K-factor) and/or higher-twist contributions cannot be excluded, although they may be weaker than in the proton case.