Melting Spectral Functions of the Scalar and Vector Mesons in a Holographic QCD Model

TL;DR

This paper uses a holographic QCD model to analyze how different mesons melt at finite temperature, revealing the order and characteristics of their spectral function changes.

Contribution

It provides a comparative study of scalar, pseudo-scalar, vector, and axial-vector mesons' melting behaviors using the soft-wall AdS/QCD model at finite temperature.

Findings

Axial-vector mesons melt earlier than vector mesons.

Scalar and pseudo-scalar mesons have similar melting temperatures, slightly earlier than vector mesons.

The study offers qualitative insights into meson melting sequences in a holographic framework.

Abstract

We investigate the finite-temperature spectral functions of heavy quarkonia by using the soft-wall AdS/QCD model. We discuss the scalar, the pseudo-scalar, the vector, and the axial-vector mesons and compare their qualitative features of the melting temperature and growing width. We find that the axial-vector meson melts earlier than the vector meson, while there appears only a slight difference between the scalar and pseudo-scalar mesons which also melt earlier than the vector meson.