Canonical interpretation of the $\eta_2(1870)$

TL;DR

This paper examines the properties of the $ ext{eta}_2(1870)$ meson, suggesting it aligns with a conventional quark-antiquark state and discussing potential mixing with hybrid states.

Contribution

It provides a detailed analysis supporting the interpretation of $ ext{eta}_2(1870)$ as a $2 ^1D_2$ $qar{q}$ state and explores hybrid mixing possibilities.

Findings

Mass and decay patterns consistent with $2 ^1D_2$ $qar{q}$ state

No contradiction with conventional meson interpretation

Discusses potential hybrid mixing scenarios

Abstract

We argue that the mass, production, total decay width, and decay pattern of the $\eta_2(1870)$ do not appear to contradict with the picture of it being the conventional $2 ^1D_2$ $q\bar{q}$ state. The possibility of the $\eta_2(1870)$ being a mixture of the conventional $q\bar{q}$ and the hybrid is also discussed.