Scalar mesons within a dynamical holographic QCD model

TL;DR

This paper uses a dynamical holographic QCD model to successfully reproduce the spectrum and decay properties of scalar mesons, providing a theoretical framework consistent with experimental data.

Contribution

It introduces a coupled dilaton-gravity background in a dynamical AdS/QCD model to describe scalar meson spectra and decay widths, aligning with experimental observations.

Findings

Reproduces the scalar meson spectrum consistent with experiments.

Provides decay width calculations supporting meson classification.

Estimates mixing angles for specific scalar mesons.

Abstract

We show that the infrared dynamics of string modes dual to $q\bar q$ states within a Dynamical AdS/QCD model of coupled dilaton-gravity background gives the Reggelike spectrum of $f0's$ scalars and higher spin mesons consistent with experimental data. The pion mass and its trajectory were also described with a scale deformation of the metric and a rescaled string mass. The available experimental decay widths of the $S\to PP$ decays provided a complementary check of the proposed classification scheme for$f_0(980)$, $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ as radial excitations of $f_0(600)$. For $f_0(980)$ we estimated a mixing angle of $\pm 20^o$ with other structures.