Properties of light scalar mesons in the complex plane

TL;DR

This paper investigates the internal structure of light scalar mesons in QCD by analyzing their couplings to various operators and photons, shedding light on their quark and gluon composition.

Contribution

It provides new insights into the flavor and glue content of the $\sigma(600)$ and $f_0(980)$ mesons through coupling studies.

Findings

Determined the couplings of $\sigma(600)$ and $f_0(980)$ to quark-antiquark operators.

Analyzed their interactions with the trace of the energy-momentum tensor.

Studied their two-photon decay properties.

Abstract

The flavour and glue structure of the light scalar mesons in QCD are probed by studying the couplings of the $\sigma(600)$ and $f_0(980)$ to the operators $\bar{q}q$, $\theta_\mu^\mu$ and to two photons.