A unified approach to hadron phenomenology at zero and finite temperatures in a hard-wall AdS/QCD model

TL;DR

This paper develops a unified hard-wall AdS/QCD model to describe meson, nucleon, and Delta-baryon properties at zero and finite temperatures, showing good agreement with data and predicting temperature effects on spectra and decay widths.

Contribution

It introduces a new parameter for a universal description of hadron spectra and couplings, extending the model to finite temperatures with temperature-dependent predictions.

Findings

Model agrees with experimental data at zero temperature.

Temperature influences hadron spectra and couplings.

Predicts finite temperature decay widths for excited states.

Abstract

We propose a unified approach to study meson, nucleon and $\Delta$-baryon properties at zero and finite temperatures in the context of hard-wall AdS/QCD model. We first combine some previous works dealing with mesons and baryons separately, and introduce a new parameter~$\xi$ so that the model could give a universal description of spectrum and couplings of both sectors in a self-consistent way. All observables calculated numerically show reasonable agreement with experimental data. We then study these observables at nonzero temperature by modifying the AdS space-time into AdS-Schwartzchild space-time. Numerically solving the model, we find an interesting temperature dependence of the spectrum and the couplings. We also make a prediction on the finite temperature decay width of some nucleon and $\Delta$ excited states.