IR-improved Soft-wall AdS/QCD Model for Baryons

TL;DR

This paper develops an infrared-improved soft-wall AdS/QCD model for baryons, accurately predicting baryon mass spectra and meson-nucleon couplings by incorporating parity-doublet patterns and consistent vacuum structures.

Contribution

It introduces an infrared-modified 5D conformal mass and Yukawa coupling in the soft-wall AdS/QCD model for baryons, including parity-doublet patterns, to improve spectral and coupling predictions.

Findings

Accurate baryon mass spectrum predictions matching experimental data.

Consistent calculation of $ ho(a_1)$ meson-nucleon coupling constant.

Model aligns with meson vacuum structure and experimental results.

Abstract

We construct an infrared-improved soft-wall AdS/QCD model for baryons by considering the infrared-modified 5D conformal mass and Yukawa coupling of the bulk baryon field. The model is also built by taking into account the parity-doublet pattern for the excited baryons. When taking the bulk vacuum structure of the meson field to be the one obtained consistently in the infrared-improved soft-wall AdS/QCD model for mesons, we arrive at a consistent prediction for the baryon mass spectrum in even and odd parity. The prediction shows a remarkable agreement with the experimental data. We also perform a calculation for the $\rho(a_1)$ meson-nucleon coupling constant and obtain a consistent result in comparison with the experimental data and many other models.