Tetraquarks in AdS/QCD

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.

Comments: 6 pages, 2 figures, invited talk given at the Sixth International Conference on Quarks and Nuclear Physics, Paris, France, April 16-20, 2012