Comment on "Chiral Corrections in Hadron Spectroscopy"

TL;DR

This paper argues that the main pattern in baryon spectroscopy arises from spontaneous chiral symmetry breaking in QCD, which cannot be explained by chiral perturbation theory that relies on explicit symmetry breaking.

Contribution

It clarifies the limitations of chiral perturbation theory in explaining baryon spectroscopy patterns related to chiral symmetry breaking.

Findings

Hyperfine interactions linked to spontaneous chiral symmetry breaking

Chiral perturbation theory cannot address these hyperfine patterns

Main baryon spectroscopy patterns are due to spontaneous, not explicit, chiral symmetry breaking

Abstract

It is shown that the principal pattern in baryon spectroscopy, which is associated with the flavor-spin dependent hyperfine interaction, is due to the spontaneous breaking of chiral symmetry in QCD and thus cannot be addressed by chiral perturbation theory, which is based on the explicit chiral symmetry breaking.