Meson spectra in a gluon condensate background

TL;DR

This paper investigates how gluon condensates affect meson spectra and quarkonium dissociation using holographic models, comparing hard wall and braneless approaches to understand confinement.

Contribution

It introduces and compares two holographic methods for modeling confinement and analyzes the impact of gluon condensates on meson spectra and bound state dissociation.

Findings

Meson spectra depend on gluon condensate in the braneless approach.

Meson spectra are unaffected by gluon condensate in the hard wall model.

Hard wall approach aligns more with expected QCD behavior.

Abstract

We study the spectra of light mesons as well as the dissociation of a quarkonium and monopole-anti monopole bound state in a gluon condensate background. In order to describe the confining phase we introduce an IR cutoff in two ways, namely the hard wall and the braneless approaches. We find that the meson spectra strongly depend on the gluon condensate in the braneless approach, while they do not in the hard wall model. The latter result appears to be a more probable feature of QCD.