QCD symmetries in excited hadrons

Understand

Recent developments for chiral and $U(1)_A$ restorations in excited hadrons are reviewed.

• We emphasize predictions of the chiral symmetry restoration scenario for axial charges and couplings to Goldstone bosons.
• Using very general chiral symmetry arguments it is shown that strict chiral restoration in a given excited nucleon forbids its decay into the $N \pi$ channel.
• We confront this prediction with the $N^*N\pi$ coupling constants extracted from the decay widths and observe a 100 % correlation of these data with the spectroscopic parity doublet patterns.