A variational fit to the lattice energy of two heavy-light mesons

TL;DR

This paper interprets lattice calculations of heavy-light meson interactions using a potential model, revealing that a four-quark potential is necessary to accurately match the lattice data.

Contribution

It introduces a modified four-quark potential model to better fit lattice data on heavy-light meson interactions, improving upon previous two-quark potential models.

Findings

Standard Qar{q} potential overestimates binding energy.

A four-quark potential provides a better fit to lattice data.

Model suggests complex multi-quark interactions are essential for accurate predictions.

Abstract

Recent lattice calculations on the interaction energy of two heavy-light mesons (Q^2\bar{q}^2) are interpreted in terms of the potential of the corresponding single heavy-light meson (Q\bar{q}). This model leads to a large overestimate of the binding compared with the lattice data -- unless the basic Q\bar{q} potential is modified to become a four-quark potential.