Domain Wall AdS/QCD

TL;DR

This paper develops a novel holographic model of QCD using domain wall fermions and D-brane configurations, capturing confinement and chiral symmetry breaking, and compares the spectrum with experimental data.

Contribution

It introduces a new AdS/QCD framework with domain wall fermions and D-brane setups, incorporating confinement and chiral fermions systematically.

Findings

Spectrum matches experimental data reasonably well

Higher dimension operators improve the model accuracy

Provides a new geometric approach to chiral symmetry breaking

Abstract

We construct a new holographic description of QCD using domain wall fermions. The construction consists of probe D7 branes in a D5 brane geometry describing quarks on a 4+1d defect in a 5+1d gauge theory. We then compactify one dimension of the D5 to introduce confinement in the gauge degrees of freedom. In addition we allow a spatial dependent mass term for the D7 brane quarks to isolate chiral fermions on 3+1d domain walls. The D7 world volume fields, when restricted to the domain wall position, provide an AdS/QCD description. We compute the spectrum and compare to data. We include higher dimension operators to systematically improve the description.