Horn, Igor: The decay of the γp system into the pπ0η final state. - Bonn, 2004. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-03920
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-03920,
author = {{Igor Horn}},
title = {The decay of the γp system into the pπ0η final state},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2004,
note = {Photoproduction of mesons provides an excellent tool for accessing properties of baryon resonances. Most existing data sets on baryon resonances have been measured in \pi N scattering experiments; photoproduction experiments provide complementary information about the internal structure. Many of the known states are not well established. Further, quark models predict more states than are known. High-statistics photoproduction experiments offer the chance to search for these "missing resonances".
The Crystal Barrel detector is optimized to detect multi-photon final states with almost 4 \pi (98%) solid-angle coverage. The Crystal Barrel consists of 1380 CsI(Tl) crystals with an excellent photon detection efficiency. It provides good energy \sigma_E and spatial \sigma_{\theta},\sigma_{\Phi} resolution throughout the entire energy range. A 3-layer scintillating fiber inner detector is used for tracking charged particles.
In 2001 high-quality photoproduction data including various final states with neutral mesons was taken by the CB-ELSA experiment at the ELectron Stretcher Accelerator (ELSA) in Bonn. Photons produced via bremsstrahlung were tagged in an energy range of 0.35 GeV < E_{\gamma} < 3.00 GeV (1.24 GeV < \sqrt{s} < 2.55 GeV).
In this work, the analysis of the \gamma p\rightarrow p\pi^{0}\eta final state is discussed. Total and differential cross sections for \gamma p\rightarrow p\pi^{0}\eta are presented from threshold energy to \sqrt{s}=2.55 GeV. This cross section was unknown up to now. Results from a partial wave analysis are presented and leading resonant contributions are extracted. However, double polarization data is necessary in order to resolve some current ambiguities and establish the solution found here.},

url = {http://hdl.handle.net/20.500.11811/2061}

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