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

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.

Comments: 12 pages, 4 tables, 1 figure, to be published in PLB