Diquark correlations in baryon spectroscopy and holographic QCD

Abstract

We improve upon recent holographic predictions for the nucleon and delta resonance spectra and show how they emerge from a straightforward extension of the “metric soft wall” AdS/QCD dual. The resulting mass formula depends on a single adjustable parameter, characterizing confinement-induced IR deformations of the anti-de Sitter metric, and on the fraction of “good” (i.e. maximally attractive) diquarks in the baryon's quark model wave function. Despite their manifest simplicity, the predicted spectra describe the masses of all 48 observed light-quark baryon states and the underlying, linear trajectory structure with unprecedented accuracy.