A note on fermions in holographic QCD

TL;DR

This paper explores the fermionic excitations in a holographic QCD model, revealing that fermionic modes have masses similar to mesons and interact strongly with them, providing insights into fermionic sectors of QCD-like theories.

Contribution

It introduces the study of fermionic fluctuations on a probe D8-brane in a holographic QCD setup, highlighting their mass spectrum and interactions with mesons.

Findings

Fermionic modes have masses comparable to mesons.

Fermionic modes interact strongly with mesons.

Fermionic fluctuations can be interpreted as mesinos.

Abstract

We study the fermionic sector of a probe D8-brane in the supergravity background made of D4-branes compactified on a circle with supersymmetry broken explicitly by the boundary conditions. At low energies the dual field theory is effectively four-dimensional and has proved surprisingly successful in recovering qualitative and quantitative properties of QCD. We investigate fluctuations of the fermionic fields on the probe D8-brane and interpret these as mesinos (fermionic superpartners of mesons). We demonstrate that the masses of these modes are comparable to meson masses and show that their interactions with ordinary mesons are not suppressed.