# Forces between composite particles in QCD

## TL;DR

This paper calculates short-range, attractive potentials between heavy-light mesons in quenched lattice QCD, analyzing the effects of different light-quark masses and gauge actions to understand meson interactions.

## Contribution

It provides the first detailed lattice QCD calculation of meson-meson potentials with various light-quark masses using staggered fermions and compares different gauge actions.

## Key findings

- Potentials are short-ranged and attractive.
- Results depend on light-quark mass parameters.
- Comparison shows differences with tadpole improved gauge action.

## Abstract

Starting from the meson-meson Green function in 3+1 dimensional quenched lattice QCD we calculate potentials between heavy-light mesons for various light-quark mass parameters. For the valence quarks we employ the staggered scheme. The resulting potentials turn out to be short ranged and attractive. A comparison with a tadpole improved action for the gauge fields is presented.