Effective Field Theories and Lattice QCD for the X Y Z frontier

TL;DR

This paper discusses how combining nonrelativistic effective field theories with lattice QCD can advance the understanding of exotic X Y Z states in strong interaction physics, highlighting opportunities and challenges.

Contribution

It introduces a novel approach integrating effective field theories and lattice QCD to study exotic hadronic states, outlining new tools needed for progress.

Findings

Lattice QCD can provide insights into X Y Z states.

Nonrelativistic effective theories complement lattice methods.

Identifies challenges and future opportunities in the field.

Abstract

Exotic states have been predicted before and after the advent of QCD. In the last decades they have been observed at accelerator experiments in the sector with two heavy quarks, at or above the quarkonium strong decay threshold and called X Y Z states. These states offer a unique possibility for investigating the dynamical properties of strongly correlated systems in QCD. I will show how an alliance of nonrelativistic effective field theories and lattice can allow us to address these states in QCD. In particular I will explain what are the opportunities and challenges of lattice QCD in this respect and which new tools should be developed.