Testing the hadro-quarkonium model on the lattice

TL;DR

This paper tests the hadro-quarkonium model on the lattice by examining how the presence of a hadron influences the static potential between heavy quarks, providing insights into exotic resonance structures.

Contribution

It provides the first lattice QCD investigation of the hadro-quarkonium model using static heavy quarks and quantifies the potential modification due to a hadron.

Findings

The static potential becomes more attractive in the presence of a hadron.

The potential modification is of the order of a few MeV.

Supports the hadro-quarkonium interpretation of exotic states.

Abstract

Recently the LHCb experiment found evidence for the existence of two exotic resonances consisting of $c\bar{c}uud$ quarks. Among the possible interpretations is the hadro-charmonium model, in which charmonium is bound "within" a light hadron. We test this idea on CLS $N_f$=2+1 lattices using the static formulation for the heavy quarks. We find that the static potential is modified by the presence of a hadron such that it becomes more attractive. The effect is of the order of a few MeV.