Abstract
Decays of baryon resonances in the second and the third resonance region into Nπ0π0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N∗ and Δ∗ resonances decaying into Δ(1232)π, N(ππ)S, N(1440)P11π, and N(1520)D13π are determined in a partial wave analysis of this data and of data from other reactions. Several partial decay widths were not known before. Interesting decay patterns are observed which are not even qualitatively reproduced by quark model calculations. In the second resonance region, decays into Δ(1232)π dominate clearly. The N(ππ)S-wave provides a significant contribution to the cross section, especially in the third resonance region. The P13(1720) properties found here are at clear variance to PDG values.
Highlights
Decays of baryon resonances in the second and the third resonance region into N π0π 0 are studied by photoproduction of two neutral pions off protons
An alternative description of the baryon spectrum may be developed in effective field theories in which baryon resonances are generated dynamically from their decays [7]
To test the different approaches, detailed information on the spectrum and decays of resonances is needed, including more complex decay modes such as π or N (π π )S, where (π π )S stands for the (π π )-Swave
Summary
Decays of baryon resonances in the second and the third resonance region into N π0π 0 are studied by photoproduction of two neutral pions off protons. The overall acceptance depends on the contributing physics amplitudes which are determined by a partial wave analysis (PWA) described below. Data taken at higher energies covering the photon energy range from 0.8 to 3 GeV yield a cross section [21] which is compatible in the overlap region with the results presented here.
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