# Study on the radiative decays of $h_c$ via intermediate meson loops model

## TL;DR

This paper investigates the radiative decays of the $h_c$ charmonium state through intermediate meson loops, providing theoretical predictions that align with recent experimental results and offering insights into $ ext{η-η'}$ mixing and SU(3) flavor symmetry.

## Contribution

It introduces a novel effective Lagrangian approach to study $h_c$ radiative decays via meson loops, matching experimental data and exploring $ ext{η-η'}$ mixing effects.

## Key findings

- Calculated branching ratios are consistent with experimental data.
- The $R_{h_c}$ ratio helps understand $ ext{η-η'}$ mixing.
- The approach supports testing SU(3) flavor symmetry in QCD.

## Abstract

Recently, the BESIII Collaboration reported two new decay processes $h_c(1P)\to \gamma \eta$ and $\gamma \eta^\prime$. Inspired by this measurement, we propose to study the radiative decays of $h_c$ via intermediate charmed meson loops in an effective Lagrangian approach. With the acceptable cutoff parameter range, the calculated branching ratios of $h_c(1P)\to \gamma \eta$ and $\gamma \eta^\prime$ are orders of $10^{-4}\sim 10^{-3}$ and $10^{-3} \sim 10^{-2}$, respectively. The ratio $R_{h_c}= \mathcal{B}( h_c\to \gamma \eta )/\mathcal{B}( h_c\to \gamma \eta^\prime )$ can reproduce the experimental measurements with the commonly acceptable $\alpha$ range. This ratio provide us some information on the $\eta-\eta^\prime$ mixing, which may be helpful for us to test SU(3)-flavor symmetries in QCD.