# A Pattern for the Flavor Dependence of the Quark-Gluon Interaction

## TL;DR

This paper develops a flavor-dependent interaction model within QCD that successfully describes various mesons, revealing that lighter quarks experience a stronger and wider infrared interaction.

## Contribution

It introduces a novel flavor-dependent kernel in the Dyson-Schwinger and Bethe-Salpeter framework, unifying the description of light to heavy mesons.

## Key findings

- Infrared interaction strength varies with quark flavor.
- Model accurately describes ground pseudoscalar and vector mesons.
- Infrared enhancement is stronger for lighter quarks.

## Abstract

A flavor dependent kernel is constructed based on the rainbow-ladder truncation of the Dyson-Schwinger and Bethe-Salpeter equation approach of Quantum Chromodynamics. The quark-antiquark interaction is composed of a flavor dependent infrared part and a flavor independent ultraviolet part. Our model gives a successful and unified description of the light, heavy and heavy-light ground pseudoscalar and vector mesons. For the first time, our model shows that the infrared enhanced quark-antiquark interaction is stronger and wider for the lighter quark.