Mesons and nucleons from holographic QCD in a unified approach

Details Mesons and nucleons from holographic QCD in a unified approach Mesons and nucleons from holographic QCD in a unified approach

2009-08-24

arxiv.org/abs/0908.3406v2

JHEP 0911:034,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, No figure. Several typos have been removed

Scientific paper

10.1088/1126-6708/2009/11/034

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.

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