High statistics study of the reaction $\gamma p\to p{\pi }^0\eta$

Abstract

Photoproduction off protons of the $p{\pi }^0\eta$ three-body final state was studied with the Crystal Barrel/TAPS detector at the electron stretcher accelerator ELSA at Bonn for incident energies from the ${\pi }^0\eta$ production threshold up to 2.5\,GeV. Differential cross sections and the total cross section are presented. The use of linearly polarized photons gives access to the polarization observables $\Sigma$, $I^s$ and $I^c$, the latter two characterize beam asymmetries in case of three-body final states. $\Delta (1232)\eta$, $N(1535)1/2^{-}\pi$, and $p{a}_0(980)$ are the dominant isobars contributing to the reaction. The partial wave analysis confirms the existence of some nucleon and $\Delta$ resonances for which so far only fair evidence was reported. A large number of decay modes of known nucleon and $\Delta$ resonances is presented. It is shown that detailed investigations of decay branching ratios may provide a key to unravelling the structure of nucleon and $\Delta$ resonances.

Submitted to EPJA, 27 pages, 32 figures, 6 tables

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• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
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