Coulomb Gauge QCD and the Excited Hadron Spectrum

TL;DR

This paper explores how Coulomb gauge QCD helps understand the excited hadron spectrum for light and heavy quarks, revealing insights into chiral symmetry and decay structures.

Contribution

It presents new insights into the excited hadron spectrum using Coulomb gauge QCD, emphasizing chiral symmetry effects and decay dynamics for heavy quarks.

Findings

Light quark spectrum shows insensitivity to chiral symmetry breaking.

Highly excited hadrons exhibit Wigner parity-degeneracy.

Heavy quark decay momentum distributions provide structure insights.

Abstract

We discuss progress in understanding the light and heavy quark excited hadron spectrum from Coulomb gauge QCD. For light quark systems we highlight the insensitivity to spontaneous chiral symmetry breaking, which predicts Wigner parity-degeneracy in the highly excited hadron spectrum and allows the quark mass momentum dependence to be experimentally probed. For heavy quark meson decays we invoke the Franck-Condon principle, a consequence of small velocity changes for heavy quarks, to extract qualitative, but model independent, structure insight from the momentum distribution of the decay products.