# Heavy Quarkonia in the Light-Front Quark Model

## TL;DR

This paper develops light-front wave functions for heavy quarkonia using a relativistic quark model, applying it to radiative transitions and comparing results with lattice QCD to enhance understanding of heavy quarkonium structure.

## Contribution

It introduces a method to construct heavy quarkonia wave functions in the light-front framework and applies it to specific radiative transitions, comparing with lattice data.

## Key findings

- Successful modeling of $J/\psi \to \eta_c \gamma$ transition
- Agreement of form factors with lattice QCD results
- Enhanced understanding of heavy quarkonium structure

## Abstract

We present recent progress in constructing heavy quarkonia light-front wave functions from the light-front quark model, a relativistic framework well-suited for describing partonic structure and hadronic form factors. In this proceeding, we discuss the recent application of the model to the $M1$ radiative transition such as $J/\psi \to \eta_c \gamma$ among other transitions. Additionally, we compare our results on the transition form factor with available lattice QCD data. These show our efforts to deepen our understanding of the structure of heavy quarkonia from light-front model perspective.