Holographic Heavy Quark Symmetry

TL;DR

This paper uses gauge/gravity duality to study heavy quark spin symmetry, showing that mass degeneracy of quarkonia is approximately achieved in QCD-like geometries, with detailed spectra and experimental comparisons.

Contribution

It introduces a holographic approach with generic D3-like geometries and D7-branes to analyze heavy quark symmetry beyond supersymmetric models.

Findings

Mass degeneracy is achieved within a few percent in QCD-like geometries.

Spectra of excited quarkonia states are computed holographically.

Results are compared with experimental data and quark-model predictions.

Abstract

We investigate the heavy quark spin symmetry, i.e. the mass degeneracy of pseudo-scalar and vector quarkonia at heavy quark limit, by using the gauge/gravity correspondence. We allow generic D3-like geometry with a flavor D7-brane, to avoid supersymmetric mass degeneracy. For geometries admitting physical QCD-like properties, we find that the mass degeneracy is generically achieved in a good accuracy, up to a few percent mass splitting. We also compute spectra of excited quarkonia states, and discuss comparisons with experiments and quark-model calculations.