Towards the assignment for the $4 ^1S_0$ meson nonet

TL;DR

This paper investigates the strong decays of certain mesons to identify the $4 ^1S_0$ meson nonet, proposing specific assignments and predicting properties of an unobserved kaon within this nonet.

Contribution

It provides a detailed analysis of meson decays using the $^3P_0$ model, supporting specific meson assignments and predicting the mass and width of an unobserved $4 ^1S_0$ kaon.

Findings

$ ext{pi}(2070)$, $ ext{eta}(2100)$, and $ ext{eta}(2225)$ are likely $4 ^1S_0$ $qar{q}$ states.

The unobserved $4 ^1S_0$ kaon is predicted to have a mass of about 2153 MeV.

The width of the $4 ^1S_0$ kaon is estimated to be approximately 197 MeV.

Abstract

The strong decays of the $\pi(2070)$, $\eta(2010)$, $\eta(2100)$, $\eta(2190)$, and $\eta(2225)$ as the $4 ^1S_0$ quark-antiquark states are investigated in the framework of the $^3P_0$ meson decay model. It is found that the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$ appear to be the convincing $4 ^1S_0$ $q\bar{q}$ states while the assignment of the $\eta(2010)$ and $\eta(2190)$ as the $4 ^1S_0$ isoscalar states is not favored by their widths. In the presence of the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$ being the members of the $4 ^1S_0$ meson nonet, the $4 ^1S_0$ kaon is phenomenologically determined to has a mass of about 2153 MeV. The width of this unobserved kaon is expected to be about 197 MeV in the $^3P_0$ decay model.