Precision Holographic Baryons

TL;DR

This paper reviews a holographic QCD model where baryons are described as Skyrmion images, enabling parameter-free derivation of baryon-meson couplings with results aligning well with empirical data.

Contribution

It introduces a holographic approach to baryons as Skyrmions, deriving baryon-meson couplings without adjustable parameters, and provides new insights into tensor couplings and their empirical relevance.

Findings

Good match with empirical nucleon data

Tensor couplings to axial-vectors and iso-singlet vectors vanish

Tensor couplings for rho mesons are dominant

Abstract

We overview a holographic QCD based on the D4-D8 string theory model, with emphasis on baryons and nucleon-meson interactions thereof. Baryons are realized as holographic images of Skyrmions, but with much qualitative changes. This allows us to derive, without adjustable parameters, couplings of baryons to the entire tower of spin one mesons and also to pseudoscalar mesons. We find some surprisingly good match against empirical values for nucleons, in particular. Tensor couplings to all axial-vectors and iso-singlet vectors all vanish, while, for $\rho$ mesons, tensor couplings are found to be dominant. We close with various cautionary comments and speculations.