Diquark correlations in baryon spectroscopy and holographic QCD

TL;DR

This paper develops an improved mass formula for light baryons based on holographic QCD, accurately predicting the spectrum of 48 observed states by incorporating diquark correlations and IR deformations in the AdS/QCD framework.

Contribution

It introduces a novel, simple mass formula derived from AdS/QCD that accounts for diquark correlations and accurately predicts baryon spectra with only one adjustable parameter.

Findings

Accurately predicts masses of 48 light-quark baryons

Reproduces linear trajectory structure of baryon spectrum

Uses a single parameter related to IR deformations and diquark content

Abstract

We introduce an improved mass formula for the nucleon and delta resonances and show how it emerges from AdS/QCD in a straightforward extension of the 'metric soft wall' gravity dual. The resulting spectrum depends on just one adjustable parameter, characterizing confinement-induced IR deformations of the anti-de Sitter (AdS) metric, and on the fraction of 'good' (i.e. maximally attractive) diquarks in the baryon's quark model wave function. Despite its simplicity, the predicted spectrum describes the masses of all 48 observed light-quark baryon states and their linear trajectory structure with unprecedented accuracy.