On modeling the scalar meson dynamics with Resonance Chiral Theory

TL;DR

This paper explores how Resonance Chiral Theory models the dynamics of light scalar mesons, focusing on fitting invariant mass distributions in phi meson radiative decays, highlighting its potential and current limitations.

Contribution

It demonstrates the applicability of Resonance Chiral Theory to scalar meson processes and discusses necessary improvements for quantitative accuracy.

Findings

RChT can describe scalar meson decays reasonably well

Further quantitative refinement of the model is needed

The study supports RChT's predictive power in scalar sector

Abstract

The features of the Resonance Chiral Theory (RChT) related to the description of the lightest scalar resonances, sigma, f0(980) and a0(980), are discussed. Major attention is paid to the fits of the invariant mass distributions in the radiative decays of the phi(1020) meson. The study of the scalar sector in RChT is motivated by the success of the theory predictive power in numerous processes with other types of resonances. We conclude that RChT is sufficiently flexible to describe these decays, however the further quantitative improvement is required. The technical work-outs and related important questions are outlined.