Chiral Symmetry Realization for Even- and Odd-parity Baryon Resonances

TL;DR

This paper explores how chiral symmetry organizes baryon resonances of different parities into multiplets, providing mass relations and decay rules that align with observed data, advancing understanding of baryon structure.

Contribution

It introduces a chiral quartet scheme linking even and odd parity baryons, offering parameter-free mass constraints and decay selection rules.

Findings

Mass relations consistent with observed baryon resonances.

Predicted decay suppression that can be experimentally tested.

Chiral symmetry provides a unifying framework for baryon parity states.

Abstract

Baryon resonances with even and odd parity are collectively investigated from the viewpoint of chiral symmetry(ChS). We propose a quartet scheme where Delta's and N^*'s with even and odd parity form a chiral multiplet. This scheme gives parameter-free constraints on the baryon masses in the quartet, which are consistent with observed masses with spin 1/2, 3/2, 5/2. The scheme also gives selection rules in the one-pion decay: The absence of the parity non-changing decay N(1720) -> pi Delta(1232) is a typical example which should be confirmed experimentally to unravel the role of ChS in baryon resonances.