$ \rho$ meson-nucleon coupling constant from the soft-wall AdS/QCD model

TL;DR

This paper calculates the rho meson-nucleon coupling constant using the soft-wall AdS/QCD model, demonstrating improved agreement with empirical data compared to the hard-wall model.

Contribution

The study introduces a calculation of the $g_{\rho NN}$ coupling constant within the soft-wall AdS/QCD framework, including magnetic interactions, and compares it to previous models.

Findings

Soft-wall model yields a $g_{\rho NN}$ value closer to empirical data.

Inclusion of magnetic interactions in the bulk Lagrangian.

Comparison shows improvement over hard-wall model results.

Abstract

In the framework of the soft-wall model of AdS/QCD we calculated the $\rho$ meson nucleon coupling constant. Bulk-to boundary propagators for the free vector and spinor fields are presented, whose boundary values correspond to $\rho$ meson and to the nucleon respectively. The interaction Lagrangian between these fields is written in the bulk of AdS space and includes magnetic type interactions as well. Using the AdS/CFT correspondence from the bulk interaction action we derived the $g_{\rho NN}$ coupling constant in the boundary QCD. We found that the soft-wall model result for the $g_{\rho NN}$ constant is more close to empirical values than the one obtained in the hard-wall model.