Comment on "On the Origin of the OZI Rule in QCD", by N. Isgur and H. B. Thacker

TL;DR

This paper discusses how instantons in QCD explain the observed violations of the OZI rule across various mesonic channels, highlighting their significance in hadronic spectroscopy and large N_c limit relations.

Contribution

It demonstrates that instantons account for the sign and magnitude of OZI-violating amplitudes in all mesonic channels, extending beyond the η' channel.

Findings

Instantons explain the sign and magnitude of OZI-violating amplitudes.

Instantons play a role in hadronic spectroscopy.

Relation between instantons and large N_c limit of QCD.

Abstract

We comment on the recent paper (hep-lat/0005006) by Isgur and Thacker on the origin of the OZI rule in QCD. We show that instantons explain the sign and magnitude of the observed OZI-violating amplitude in all mesonic channels, not just in the $\eta'$ channel. We comment on the role of instantons in hadronic spectroscopy and the relation between instantons and the large $N_c$ limit of QCD.