Applications of AdS/QCD and Light-Front Holography to Baryon Physics

TL;DR

This paper explores how AdS/QCD and light-front holography provide a semi-analytic, relativistic framework for understanding baryon physics, accurately modeling hadronic spectra and form factors.

Contribution

It introduces a novel application of AdS/QCD combined with light-front holography to baryon physics, offering a new way to derive hadronic wavefunctions and predict observable properties.

Findings

Accurately models hadronic spectra including zero mass pion

Predicts electromagnetic form factors and decay constants

Provides a systematic improvement pathway using light-front Hamiltonian methods

Abstract

The correspondence between theories in anti-de Sitter space and field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD which has scale invariance at short distances and color confinement at large distances. These equations, for both mesons and baryons, give a very good representation of the observed hadronic spectrum, including a zero mass pion. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The meson and baryon wavefunctions derived from light-front holography and AdS/QCD also have remarkable phenomenological features, including predictions for the electromagnetic form factors and decay constants. The approach can be systematically improved using light-front Hamiltonian methods. Some novel features of QCD for baryon physics are also discussed.