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

CBELSA/TAPS collaboration: M. Gottschall , F. Afzal , A.V. Anisovich , D. Bayadilov , R. Beck , M. Bichow , K.-Th. Brinkmann , V. Crede

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M. Dieterle F. Dietz H. Dutz H. Eberhardt D. Elsner R. Ewald K. Fornet-Ponse St. Friedrich F. Frommberger A. Gridnev M. Gr\"uner E. Gutz Ch. Hammann J. Hannappel J. Hartmann W. Hillert Ph. Hoffmeister Ch. Honisch T. Jude S. Kammer H. Kalinowsky I. Keshelashvili P. Klassen F. Klein E. Klempt K. Koop B. Krusche M. Kube M. Lang I. Lopatin P. Mahlberg K. Makonyi V. Metag W. Meyer J. M\"uller J. M\"ullers M. Nanova V. Nikonov R. Novotny D. Piontek G. Reicherz T. Rostomyan A. Sarantsev Ch. Schmidt H. Schmieden T. Seifen V. Sokhoyan K. Spieker A. Thiel U. Thoma M. Urban H. van Pee D. Walther Ch. Wendel D. Werthm\"uller U. Wiedner A. Wilson A. Winnebeck L. Witthauer Y. Wunderlich

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

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