# Is the $Y(2175)$ a Strangeonium Hybrid Meson?

## TL;DR

This study uses QCD sum-rules to investigate whether the Y(2175) meson can be a strangeonium hybrid, finding that its weak signal challenges this interpretation.

## Contribution

The paper applies Gaussian sum-rules with a two-resonance model to assess the hybrid meson nature of Y(2175), providing new insights into its structure.

## Key findings

- Y(2175) has less than 5% resonance strength compared to a 2.9 GeV state.
- Results challenge the interpretation of Y(2175) as a dominant hybrid meson.
- Method demonstrates the use of sum-rules for meson structure analysis.

## Abstract

QCD Gaussian sum-rules are used to explore the vector ($J^{PC}=1^{--}$) strangeonium hybrid interpretation of the $Y(2175)$. Using a two-resonance model consisting of the $Y(2175)$ and an additional resonance, we find that the relative resonance strength of the $Y(2175)$ in the Gaussian sum-rules is less than 5\% that of a heavier 2.9 GeV state. This small relative strength presents a challenge to a dominantly-hybrid interpretation of the $Y(2175)$.