Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD

TL;DR

This paper explores the chiral phase transition and meson spectra in an improved soft-wall AdS/QCD model, demonstrating good agreement with experimental data and lattice simulations for thermal and low-energy QCD properties.

Contribution

The study introduces a modified 5D conformal mass in the soft-wall AdS/QCD model to accurately describe chiral transition and meson spectra, aligning with lattice and experimental results.

Findings

Chiral transition exhibits crossover behavior consistent with lattice QCD.

Meson spectra and decay constants match experimental data except for pion decay constant.

The model predicts a realistic chiral transition temperature.

Abstract

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.