Electromagnetic structure of nucleon and Roper in soft-wall AdS/QCD

TL;DR

This paper improves the modeling of nucleon and Roper electromagnetic form factors using an extended soft-wall AdS/QCD approach, incorporating non-minimal terms that enhance the description of form factor momentum dependence.

Contribution

It introduces non-minimal terms into the soft-wall AdS/QCD model, significantly improving the momentum dependence of nucleon and Roper form factors without altering charge normalization.

Findings

Enhanced agreement with experimental form factor data

Non-minimal terms improve momentum dependence modeling

Maintains charge normalization of form factors

Abstract

We present an improved study of the electromagnetic form factors of the nucleon and of the Roper-nucleon transition using an extended version of the effective action of soft-wall AdS/QCD. We include novel contribution from additional non-minimal terms, which do not renormalize the charge and do not change the normalization of the corresponding form factors, but the inclusion of these terms results in an important contribution to the momentum dependence of the form factors and helicity amplitudes.