Evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$

TL;DR

This paper presents evidence supporting the four-quark model for light scalar mesons $f_0(980)$ and $f_0(500)$, based on analysis of high-statistics BESIII decay data, expanding the validity of the $q^2ar q^2$ model.

Contribution

It demonstrates that BESIII decay data can be interpreted to support the four-quark nature of specific light scalar mesons, extending the model's applicability.

Findings

BESIII data supports four-quark structure of $f_0(980)$ and $f_0(500)$

Analysis confirms the $q^2ar q^2$ model for light scalars

High-statistics data strengthens evidence for exotic meson configurations

Abstract

There exists a great deal of concrete evidence in favor of the exotic four-quark nature of light scalars. At the same time, the further expansion of the area of the $q^2\bar q^2$ model validity for light scalars on ever new processes seems extremely interesting and important. We analyze the BESIII data on the decay $J/\psi\to \gamma\pi^0\pi^0$ and show that the results of this high-statistics experiment can be interpreted in favor of the four-quark nature of light scalar mesons $f_0(980)$ and $f_0(500)$.