# Event generators for $\eta/\eta^{\prime}$ decays at BESIII

## TL;DR

This paper presents a set of validated event generators for $ta/ta^{}$ decays, aiding the study of non-perturbative QCD and new physics, with proven effectiveness in BESIII analyses.

## Contribution

The paper introduces new event generators for various $ta/ta^{}$ decay modes, validated for use in BESIII experiments and beyond.

## Key findings

- Generators accurately reproduce BESIII data.
- Validated for efficiency and background studies.
- Useful for future $ta/ta^{}$ physics analyses.

## Abstract

The light unflavoured meson $\eta/\eta^{\prime}$ decays are valuable for testing non-perturbative quantum chromodynamics and exploring new physics beyond the Standard Model. This paper describes a series of event generators, including $\eta/\eta^{\prime}\to\gamma l^{+}l^{-}$, $\eta/\eta^{\prime}\to\gamma \pi^{+}\pi^{-}$, $\eta^{\prime}\to\omega e^{+}e^{-}$, $\eta\to\pi^{+}\pi^{-}\pi^{0}$, $\eta/\eta^{\prime}\to\pi^{0}\pi^{0}\pi^{0}$, $\eta^{\prime}\to\eta\pi\pi$ and $\eta^{\prime}\to\pi^{+}\pi^{-}\pi^{+}\pi^{-}/\pi^{+}\pi^{-}\pi^{0}\pi^{0}$, which have been developed for investigating $\eta/\eta^\prime$ decay dynamics. For most of these generators, their usability has been validated in BESIII analyses for determining the detection efficiency, and background studies. The consistency between data and Monte Carlo shows that these generators work well in the BESIII simulation, and will also be useful for ongoing BESIII analyses and other experiments for studying $\eta/\eta^\prime$ physics.