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Measurement of the Helicity Asymmetry E for the reaction γ pto π⁰ p

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arxiv 1904.12560 v1 pith:SY72BFHN submitted 2019-04-29 nucl-ex

Measurement of the Helicity Asymmetry E for the reaction γ pto π⁰ p

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keywords gammabonndatalongitudinally-polarizedmeasurementrangereactionwere
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A measurement of the double-polarization observable $E$ for the reaction $\gamma p\to \pi^0 p$ is reported. The data were taken with the CBELSA/TAPS experiment at the ELSA facility in Bonn using the Bonn frozen-spin butanol (C$_4$H$_9$OH) target, which provided longitudinally-polarized protons. Circularly-polarized photons were produced via bremsstrahlung of longitudinally-polarized electrons. The data cover the photon energy range from $E_\gamma =600$~MeV to $E_\gamma =2310$~MeV and nearly the complete angular range. The results are compared to and have been included in recent partial wave analyses.

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