N* and Delta* decays into N pi0 pi0

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)P_{11} pi, and N(1520)D_{13} 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 P_{13}(1720) properties found here are at clear variance to PDG values.

13 pages, 4 figures, long author's list

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Cited by in corpus (41)

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• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Photoproduction of $\eta$ mesons off neutrons from a deuteron target
• Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis
• Photoproduction of mesons off nuclei
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz
• Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton
• Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region
• P-wave excited baryons from pion- and photo-induced hyperon production
• Mixing of pseudoscalar-baryon and vector-baryon in the $J^P=1/2^{-}$ sector and the $N^{\ast }$(1535) and $N^{\ast }$(1650) resonances
• Study of the quasi-free $np\to np{\pi }^{+}{\pi }^{-}$ reaction with a deuterium beam at 1.25 GeV/nucleon
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0$-pairs off the proton and off the neutron
• Spectroscopy of Light Baryons: $\Delta$ Resonances
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• New data on $\vec{\gamma }\vec{p}\to \eta p$ with polarized photons and protons and their implications for $N^{\ast }\to N\eta$ decays
• π^0 π^0 Production in Proton-Proton Collisions at Tp=1.4 GeV
• Measurement of the beam-helicity asymmetry $I^{\odot }$ in the photoproduction of ${\pi }^0{\pi }^{\pm }$-pairs off protons and off neutrons
• Photoproduction ofeta-pi pairs off nucleons and deuterons
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
• Two-Pion production in the second resonance region in ${\pi }^{-}p$ collisions with HADES
• Searching for the quark--diquark systematics of baryons composed by light quarks $q=u,d$
• High energy cosmic-ray interactions with particles from the Sun
• Partial Decay Widths of Negative Parity Baryons in the 1/Nc Expansion
• A case in favor of the $N^{\ast }(1700)(3/2^{-})$
• Observation of a structure in the M${}_{p\eta }$ invariant mass distribution near 1700 MeV/$c^2$ in the $\gamma \mathbf{p}\to \mathbf{p}{\pi }^0\eta$ reaction
• Minimal complete sets for two pseudoscalar meson photoproduction
• First measurement of helicity-dependent cross sections in pi0-eta photoproduction from quasi-free nucleons
• Helicity-dependent cross sections for the photoproduction of ${\pi }^0$ pairs from nucleons
• On the background in the $\gamma p\to \omega ({\pi }^0\gamma )p$ reaction and mixed event simulation
• An event mixing technique for Bose-Einstein correlations of two pions in photoproduction around 1 GeV
• Theory of two-pion photo- and electroproduction off the nucleon
• Measurement of the beam-helicity asymmetry in photoproduction of ${\pi }^0\eta$ pairs on carbon, aluminum, and lead
• Experiments needed in Meson and Baryon Spectroscopy
• Quasi-free photoproduction of pion-pairs off protons and neutrons