# Charmonium and exotics from lattice QCD

## TL;DR

This paper reviews lattice QCD results on charmonium spectrum and exotic states, exploring the hadro-quarkonium model and charm quark decoupling effects through lattice and model calculations.

## Contribution

It provides the first lattice study of the hadro-quarkonium model with static quarks and evaluates charm quark decoupling corrections in the continuum.

## Key findings

- Lattice results on charmonium spectrum and exotics summarized.
- First lattice investigation of the hadro-quarkonium model presented.
- Quantitative analysis of charm quark decoupling effects conducted.

## Abstract

We review selected lattice results on the charmonium spectrum and first attempts to search for the existence of exotic states. The hadro-quarkonium model was proposed to interpret some of the exotic states as a quarkonium core inside a hadron. We present a lattice study of the hadro-quarkonium model in the limit of static quarks. The charm quark decouples in low energy observables and binding energies of charmonium. In a model calculation we are able to evaluate the corrections to decoupling of the charm quark in the continuum.