# Heavy hybrids and tetraquarks in effective field theory

## TL;DR

This paper develops an effective field theory framework to describe exotic quarkonia, including hybrids and tetraquarks, using static energies derived from Wilson loops, and discusses recent results on mixing, spin effects, and decays.

## Contribution

It introduces a new EFT approach to model hybrid and tetraquark static energies and explores their mixing with standard quarkonium, incorporating recent lattice and dynamical quark data.

## Key findings

- Hybrid static energies are consistent with quenched lattice calculations.
- Additional states like heavy meson pairs are relevant for a complete description.
- Results on mixing, spin effects, and semi-inclusive decays of hybrids are presented.

## Abstract

We report on an effective field theory (EFT) description of exotic quarkonia as bound states on the spectrum of hybrid and tetraquark static energies. We provide expressions for hybrid and tetraquark static energies in terms of Wilson loops. The former have been computed in quenched lattice calculations but the latter are yet unavailable. From the few simulations with dynamical light-quarks we argue that the overall picture from hybrid static energies does not change but additional states, such as heavy meson pairs, need to be considered for a full description. In this EFT framework for quarkonium hybrids, we report on recent results for mixing with standard quarkonium, spin-dependent contributions, and semi-inclusive decays.