Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from \gamma p\to p\pi^0\eta

TL;DR

This paper presents evidence for a parity doublet of Delta resonances with J=3/2, identified through photoproduction experiments involving p pi^0 eta final states, revealing new insights into baryon resonance structures.

Contribution

It provides experimental evidence for the existence of a parity doublet of Delta(1920)P_{33} and Delta(1940)D_{33} resonances, a novel observation in baryon spectroscopy.

Findings

Identification of Delta(1920)P_{33} and Delta(1940)D_{33} as parity partners.

Observation of cascade decays into Delta(1232) eta, N(1535) pi, and N a_0(980).

Significant contributions of these resonances to the photoproduction process.

Abstract

Evidence is reported for the existence of a parity doublet of Delta resonances with total angular momentum J=3/2 from photoproduction of the p pi^0 eta final state. The two parity partners Delta(1920)P_{33} and Delta(1940)D_{33} make significant contributions to the reaction. Cascades of resonances into Delta(1232) eta, N(1535) pi, and N a_0(980) are clearly observed.