Nucleon structure including high Fock states in AdS/QCD

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.

24 pages, 14 figures

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• Light baryons and their electromagnetic interactions in the covariant constituent quark model
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• IR-improved Soft-wall AdS/QCD Model for Baryons
• Deuteron electromagnetic structure functions and polarization properties in soft-wall AdS/QCD
• Transverse charge and magnetization densities in holographic QCD
• Baryons in a soft-wall AdS-Schwarzschild approach at low temperature
• Nucleon resonances with higher spins in soft-wall AdS/QCD
• Family of dilatons and metrics for AdS/QCD models
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• Electromagnetic properties of the nucleon and the Roper resonance in soft-wall AdS/QCD at finite temperature
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• Gluon parton densities in soft-wall AdS/QCD
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• Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approach
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• Melting of scalar hadrons in an AdS/QCD model modified by a thermal dilaton
• Charge and longitudinal momentum distributions in transverse coordinate space
• Form factors and transverse charge and magnetization densities in the hard-wall AdS/QCD model
• Light-front potential for heavy quarkonia constrained by the holographic soft-wall model
• Scaling of PDFs, TMDs, and GPDs in soft-wall AdS/QCD
• $\rho$ meson-nucleon coupling constant from the soft-wall AdS/QCD model
• Analytic parametrizations of the ${\gamma }^{\ast }N\to N(1440)$ form factors inspired by Light-Front holography
• Generalized parton distributions in the soft-wall model of AdS/QCD
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• Holographic estimate of the meson cloud contribution to nucleon axial form factor
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• $a_1$ meson-baryon coupling constants in the framework of soft-wall and hard-wall AdS/QCD models
• Transverse densities and generalized parton distributions of $\rho$ meson in light front quark model
• Neutrino-nucleon DIS from Holographic QCD: PDFs of sea and valence quarks, form factors, and structure functions of the proton
• A Comparative Study of Nucleon Structure in Light-Front Quark Models in AdS/QCD
• Axial-vector form factor of nucleons at finite temperature from the AdS/QCD soft-wall model
• A unified approach to hadron phenomenology at zero and finite temperatures in a hard-wall AdS/QCD model
• Baryon as dyonic instanton
• Transverse charge densities of the deuteron in soft-wall AdS/QCD
• Two-body light front wave functions from general AdS/QCD models
• Higher-twist fermionic operators and DIS structure functions from the AdS/CFT duality
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• Effects of beta function on mass and melting temperature for scalar glueballs in AdS/QCD models at finite temperature