Measurement of the helicity asymmetry E for the reaction γ p→π ^0 p

M. Gottschall, F. Afzal, A. V. Anisovich, D. Bayadilov, R. Beck, M. Bichow,K. Th. Brinkmann, V. Crede, M. Dieterle, F. Dietz, H. Dutz, H. Eberhardt, D. Elsner, R. Ewald, K. Fornet-Ponse, St. Friedrich, F. Frommberger, A. Gridnev, M. Grüner,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. Müller, J. Müllers, 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. Werthmüller, U. Wiedner,A. Wilson, A. Winnebeck, L. Witthauer, Y. Wunderlich

The European Physical Journal A（2021）

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摘要

measurement of the double-polarization observable E for the reaction γ p→π ^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_γ =600 to 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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关键词

helicity asymmetry,\gamma

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