Chiral quarks, chiral limit, nonanalytic terms and baryon spectroscopy

TL;DR

This paper demonstrates that the main features of baryon spectroscopy linked to hyperfine interactions are rooted in spontaneous chiral symmetry breaking in QCD and remain valid in the chiral limit, with finite quark mass effects being suppressed.

Contribution

It reveals that the dominant pattern in baryon spectroscopy is due to chiral symmetry breaking and persists in the chiral limit, with finite quark mass corrections being negligible.

Findings

Hyperfine interaction pattern is due to chiral symmetry breaking.

Main pattern persists in the chiral limit.

Finite quark mass corrections are suppressed.

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 persists in the chiral limit. All corrections, which are associated with a finite quark (Goldstone boson) mass are suppressed by the factor $(\mu/\Lambda_\chi$)^2 and higher.