Linear square-mass trajectories of radially and orbitally excited hadrons in holographic QCD

TL;DR

This paper introduces a holographic QCD model that successfully reproduces the linear mass trajectories of excited hadrons, aligning well with experimental data and offering new insights into confinement and hadron spectra.

Contribution

It presents a novel holographic dual framework that captures linear hadron trajectories and confinement features using a single infrared deformation parameter.

Findings

Reproduces linear mass trajectories with universal slope

Provides new relations between trajectory slopes and ground state masses

Achieves good agreement with experimental hadron spectra

Abstract

We consider a new approach towards constructing approximate holographic duals of QCD from experimental hadron properties. This framework allows us to derive a gravity dual which reproduces the empirically found linear square-mass trajectories of universal slope for radially and orbitally excited hadrons. Conformal symmetry breaking in the bulk is exclusively due to infrared deformations of the anti-de Sitter metric and governed by one free mass scale proportional to Lambda_QCD. The resulting background geometry exhibits dual signatures of confinement and provides the first examples of holographically generated linear trajectories in the baryon sector. The predictions for the light hadron spectrum include new relations between trajectory slopes and ground state masses and are in good overall agreement with experiment.