Mesons and nucleons from holographic QCD in a unified approach

Abstract

We investigate masses and coupling constants of mesons and nucleons within a hard wall model of holographic QCD in a unified approach. We first examine an appropriate form of fermionic solutions by restricting the mass coupling for the five dimensional bulk fermions and bosons. We then derive approximated analytic solutions for the nucleons and the corresponding masses in a small mass coupling region. In order to treat meson and nucleon properties on the same footing, we introduce the same infrared (IR) cut in such a way that the meson-nucleon coupling constants, i.e., g_{pi NN} and g_{rho NN} are uniquely determined. The first order approximation with respect to a dimensionless expansion parameter, which is valid in the small mass coupling region, explicitly shows difficulties to avoid the IR scale problem of the hard wall model. We discuss possible ways of circumventing these problems.

arXiv comment15 pages, No figure. Several typos have been removed

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• Nucleon structure including high Fock states in AdS/QCD
• Nucleon resonances in AdS/QCD
• Generalized parton distributions in an AdS/QCD hard-wall model
• Holography at work for nuclear and hadron physics
• Mesons and Nucleons in Soft-Wall AdS/QCD
• Improving the Excited Nucleon Spectrum in Hard-Wall AdS/QCD
• Delocalized SYZ Mirrors and Confronting Top-Down $SU(3)$-Structure Holographic Meson Masses at Finite $g$ and $N_c$ with P(article) D(ata) G(roup) Values
• Baryon spectrum in a finite-temperature AdS/QCD model
• Meson effective mass in the isospin medium in hard-wall AdS/QCD model
• Electromagnetic transition form factors of nucleons from the hard-wall AdS/QCD model