Nucleon structure including high Fock states in AdS/QCD

TL;DR

This paper models nucleon structure using a holographic soft-wall approach, incorporating high Fock states with varying parton numbers, and achieves good agreement with experimental form factor data.

Contribution

It introduces a holographic model that includes high Fock states with adjustable parton components to better describe nucleon form factors.

Findings

Successful modeling of nucleon form factors with minimal parameters

Inclusion of 3, 4, and 5 parton Fock states improves data agreement

The approach bridges holographic QCD with detailed nucleon structure

Abstract

We present a detailed analysis of nucleon electromagnetic and axial form factors in a holographic soft-wall model. This approach is based on an action which describes hadrons with broken conformal invariance and incorporates confinement through the presence of a background dilaton field.For Nc=3 we describe the nucleon structure in a superposition of a three valence quark state with high Fock states including an adjustable number of partons (quarks, antiquarks and gluons) via studying the dynamics of 5D fermion fields of different scaling dimension in anti-de Sitter (ADS) space. According to the gauge/gravity duality the 5D fermion fields of different scaling dimension correspond to the Fock state components with a specific number of partons. In the present application we restrict to the contribution of 3, 4 and 5 parton components in the nucleon Fock state. With a minimal number of free parameters (dilaton scale parameter, mixing parameters of partial contributions of Fock states, coupling constants in the effective Lagrangian) we achieve a reasonable agreement with data for the nucleon form factors.