The s-sbar and K-Kbar nature of f_0(980) in D_s decays

TL;DR

This paper investigates the internal structure of the f_0(980) resonance in D_s decays using a quark-meson model, showing it as mainly s sbar with K Kbar components, aligning with experimental data.

Contribution

It introduces a model combining heavy quark and chiral symmetries to analyze f_0(980) in D_s decays, providing insights into its quark composition.

Findings

Good agreement with E791 data on D_s -> 3pi via f_0(980)

f_0(980) is mainly s sbar with K Kbar components

Extended analysis to D_s -> phi pi process

Abstract

We examine the D_s -> f_0(980) pi amplitude through a constituent quark-meson model, incorporating heavy quark and chiral symmetries, finding a good agreement with the recent E791 data analysis of D_s -> 3pi via f_0(980). The f_0(980) resonance is considered at the moment of production as an s sbar state, later evolving to a superposition of mainly s sbar and K Kbar. The analysis is also extended to the more frequent process D_s -> phi pi.