Tetraquarks in AdS/QCD

TL;DR

This paper explores how tetraquark correlations influence the hadron spectrum using the AdS/QCD holographic framework, revealing strong four-quark binding in light scalar mesons and explaining the absence of higher tetraquark states.

Contribution

It provides a holographic model demonstrating the emergence of tetraquark correlations and their impact on scalar mesons within the AdS/QCD approach.

Findings

Strong four-quark binding in light scalar mesons

Tetraquark states become broad and unobservable at higher energies

Holographic realization of tetraquark dominance in certain mesons

Abstract

Multiquark correlations inside hadrons can have a significant and in some cases even striking impact on the hadron spectrum. We show how such correlations in general, and mesons with a dominant tetraquark content in particular, emerge holographically in the AdS/QCD framework. On this basis, we arrive at a holographic realization of an exceptionally strong four-quark binding and a correspondingly large tetraquark component in the lightest scalar mesons. Higher-lying tetraquark excitations, on the other hand, become too broad to form supernumeral scalar states.