Abstract
The Crystal Barrel/TAPS experiment is ideally suited to measure neutral mesons decaying into photons due to its high detection efficiency for photons, good energy resolution, and the nearly complete solid angle coverage. In combination with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam the experiment allows the measurement of a large set of polarization observables. The presented preliminary results for polarization observables of neutral double pion production obtained with a transversely polarized target show significant deviations from current predictions of partial wave analyses. This clearly indicates that 2π0-photoproduction is not yet understood.
Highlights
In order to extract the contributing resonances from experimental data a partial wave analysis needs to be performed
In the regime of high mass baryon resonances multi-meson nal states are of particular importance
Their cross section increases relative to the single meson photoproduction and cascading decays via other baryon resonances occur
Summary
In order to extract the contributing resonances from experimental data a partial wave analysis needs to be performed. In the regime of high mass baryon resonances multi-meson nal states are of particular importance. Their cross section increases relative to the single meson photoproduction and cascading decays via other baryon (and meson) resonances occur. Neutral double pion production is of great interest due to its quite low contribution from background amplitudes compared to charged multi-pion nal states. This is an Open Access article published by World Scienti c Publishing Company. Further distribution of this work is permitted, provided the original work is properly cited
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