# Study of $\eta$-meson Decays at KLOE/KLOE-2

## TL;DR

This paper reports on precision measurements of various eta-meson decays conducted at the KLOE/KLOE-2 experiments, including searches for symmetry-violating decays and detailed decay distribution analyses.

## Contribution

It provides new experimental results on eta-meson decay modes, including searches for C and CP violation and detailed decay dynamics, enhancing understanding of meson decay processes.

## Key findings

- Search for $C$-violating decay $ ext{eta}
ightarrow ext{gamma} ext{gamma} ext{gamma}$
- Determination of $CP$ asymmetry in $ ext{eta}
ightarrow ext{pi}^+ ext{pi}^- ext{e}^+ ext{e}^-$
- Precision measurement of $ ext{eta}
ightarrow ext{pi}^+ ext{pi}^- ext{pi}^0$ Dalitz plot distribution

## Abstract

Working at a $\phi$-factory, KLOE/KLOE-2 has collected a very large and clean sample of $\eta$ decays, which allow to perform a variety of precision measurements. This report presents the recent results on the $\eta$-meson decays from KLOE/KLOE-2 experiments, including the search of the $C$-violating decay $\eta\rightarrow\gamma\gamma\gamma$, the determination of the $CP$ asymmetry in $\eta\rightarrow\pi^+\pi^-e^+e^-$, the precision measurement of the $\eta\rightarrow\pi^+\pi^-\pi^0$ Dalitz plot distribution, the search for the $CP$-violating decay $\eta\rightarrow\pi^+\pi^-$ and the precision measurement of ${\cal O}(p^6)$ dominated decay $\eta\rightarrow\gamma\gamma\pi^0$.