Study of the reaction $\gamma p\to p{\pi }^0\eta$

Abstract

The reaction $\gamma p\to p{\pi }^0\eta$ has been studied with the CBELSA detector at the tagged photon beam of the Bonn electron stretcher facility. The reaction shows contributions from ${\Delta }^{+}(1232)\eta$, $N(1535{)}^{+}{\pi }^0$ and $p{a}_0(980)$ as intermediate states. A partial wave analysis suggests that the reaction proceeds via formation of six $\Delta$ resonances, $\Delta (1600)P_{33}$, $\Delta (1920)P_{33}$, $\Delta (1700)D_{33}$, $\Delta (1940)D_{33}$, $\Delta (1905)F_{35}$, $\Delta (2360)D_{33}$, and two nucleon resonances $N(1880)P_{11}$ and $N(2200)P_{13}$, for which pole positions and decay branching ratios are given.

arXiv comment13 pages, 10 figures, 7 tables

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• Compton scattering off proton in the third resonance region
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• Measurement of the beam-helicity asymmetry in photoproduction of ${\pi }^0\eta$ pairs on carbon, aluminum, and lead
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