The Brief Life of a Hadron: QCD unquenched

TL;DR

This paper discusses the importance of decay processes in understanding hadron structure and the role of strong coupling QCD in hadron formation, emphasizing that decays are fundamental to hadron existence.

Contribution

It highlights the significance of decay channels in hadron physics and advocates for their inclusion in QCD studies to better understand quark-hadron dynamics.

Findings

Decays are essential for hadron existence

Decay channels reveal strong coupling QCD insights

Understanding decays improves hadron models

Abstract

Once upon a time, the picture of hadrons was of mesons made of a quark and an antiquark, and baryons of three quarks. Though hadrons heavier than the ground states inevitably decay by the strong interaction, the successes of the quark model might suggest their decays are a mere perturbation. However, Eef van Beveren, whose career we celebrate here, recognised that decays are an integral part of the life of a hadron. The channels into which they decay are often essential for their very existence. These hold the secrets of strong coupling QCD and teach us the way quarks really build hadrons.