Lattice Study of Low-lying Nonet Scalar Mesons in Quenched Approximation

TL;DR

This lattice QCD study investigates the properties of the $$ meson within the quenched approximation, revealing a higher mass than experimental values, suggesting it may have an unconventional structure beyond a simple quark-antiquark pair.

Contribution

First lattice QCD analysis of the $$ meson in the quenched approximation comparing with experimental data and discussing its possible non-quark-antiquark structure.

Findings

The calculated $$ meson mass is significantly higher than experimental values.

The $$ meson may have an unconventional structure beyond a simple quark-antiquark model.

Abstract

Using lattice QCD simulation in the quenched approximation, we study the $\kappa$ meson, which is ^3P_0 in the quark model, and compare experimental and other lattice data. The $\kappa$ is the lowest scalar meson with strangeness and constitutes the scalar nonet. The obtained mass is much higher than the recent experimental value, and therefore the $\kappa(800)$ is difficult to consider as a simple two-body constituent-quark structure, and may have another unconventional structure.