Modification of generalized vector form factors and transverse charge densities of the nucleon in nuclear matter

TL;DR

This paper studies how the internal structure and charge distribution of the nucleon change within nuclear matter, showing that nucleons become larger and their form factors decrease faster compared to free space.

Contribution

It introduces a modified $ ho$-$ ho$-$ ho$ soliton model to analyze medium effects on nucleon form factors and transverse charge densities.

Findings

Nucleon form factors decrease faster in nuclear matter.

Charge radii of nucleons increase in nuclear medium.

Transverse charge densities reveal larger nucleon size in medium.

Abstract

We investigate the medium modification of the generalized vector form factors of the nucleon, which include the electromagnetic and energy-momentum tensor form factors, based on an in-medium modified $\pi$-$\rho$-$\omega$ soliton model. We find that the vector form factors of the nucleon in nuclear matter fall off faster than those in free space, which implies that the charge radii of the nucleon become larger in nuclear medium than in free space. We also compute the corresponding transverse charge densities of the nucleon in nuclear matter, which clearly reveal the increasing of the nucleon size in nuclear medium.