Signatures for tetraquark mixing from partial decay widths of the two light-meson nonets

TL;DR

This paper examines how experimental decay widths of light and heavy meson nonets support a tetraquark mixing model, highlighting an unnatural pattern explained by coupling differences predicted by the model.

Contribution

It provides evidence for the tetraquark mixing model by analyzing partial decay widths and explaining observed patterns in meson nonets.

Findings

Partial decay widths support the tetraquark mixing model.

Enhanced coupling in light nonet explains larger decay widths.

Unnatural decay width pattern is consistent with model predictions.

Abstract

In this talk, we present successful aspects of the tetraquark mixing model for the two light-meson nonets in the $J^{PC} = 0^{++}$ channel, the light nonet [$a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$] and the heavy nonet [$a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, $f_0(1500)$]. In particular, we focus on how their experimental partial decay widths extracted from Particle Data Group (PDG) can support this mixing model. Currently, the experimental data exhibit an unnatural tendency that partial widths of the light nonet are consistently larger than those of the heavy nonet. This unnatural tendency can be explained if the coupling into two pseudoscalar mesons is enhanced in the light nonet and suppressed in the heavy nonet as predicted by the tetraquark mixing model. Therefore, this could be strong evidence to support for the tetraquark mixing model.