N∗ and Δ∗ decays into Nπ0π0

2007/07/31 by U. Thoma, M. Fuchs, A. V. Anisovich +57 · 5 citations
Mathematics · Physics and Astronomy · #Geometry #Mathematics #Nuclear physics research studies #Partial wave analysis #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Pion #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #hep-ph

paper · pdf · doi:10.1016/j.physletb.2007.11.054

13 pages, 4 figures, long author's list

arxiv created 2007/11/30 · openalex publication_date 2007/12/05 · arxiv updated 2015/05/12 · openalex created_date 2022/08/13 · openalex updated_date 2026/08/01

Abstract

Decays of baryon resonances in the second and the third resonance region into N pi0 pi0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N* and Delta* resonances decaying into Delta(1232) pi, N(ππ)_S, N(1440)P₁₁ pi, and N(1520)D₁₃ pi are determined in a partial wave analysis of this data, and 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 Delta(1232) pi 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.

Citations

• Resonance contributions toηphotoproduction on protons found using dispersion relations and an isobar model
• Photoproduction of baryons decaying into Nπ and Nη
• The light-baryon spectrum in a relativistic quark model with instanton-induced quark forces
• Baryon resonances and polarization transfer in hyperon photoproduction
• Measurement of the reaction γp → K0Σat photon energies up to 2.6 GeV⋆
• Review of Particle Physics
• Beam-polarization asymmetries for the p(gamma-->, K+)Lambda and p(gamma-->, K+)Sigma(0) reactions for E(gamma)=1.5-2.4 GeV.

Cited by

• Light Baryon Spectroscopy
• Mixing of pseudoscalar-baryon and vector-baryon in theJP=1/2−sector and theN*(1535) andN*(1650) resonances
• Case in favor of theN*(1700)(3/2−)
• Photoproduction of η -mesons off neutrons from a deuteron target
• Two-pion production in the second resonance region in π−p collisions with the High-Acceptance Di-Electron Spectrometer (HADES)