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Measurement of the Helicity Asymmetry $E$ for the reaction $ \gamma p\to \pi^0 p$

Authors :
collaboration, CBELSA/TAPS
Gottschall, M.
Afzal, F.
Anisovich, A. V.
Bayadilov, D.
Beck, R.
Bichow, M.
Brinkmann, K. -Th.
Crede, V.
Dieterle, M.
Dietz, F.
Dutz, H.
Eberhardt, H.
Elsner, D.
Ewald, R.
Fornet-Ponse, K.
Friedrich, St.
Frommberger, F.
Gridnev, A.
Grüner, M.
Gutz, E.
Hammann, Ch.
Hannappel, J.
Hartmann, J.
Hillert, W.
Hoffmeister, Ph.
Honisch, Ch.
Jude, T.
Kammer, S.
Kalinowsky, H.
Keshelashvili, I.
Klassen, P.
Klein, F.
Klempt, E.
Koop, K.
Krusche, B.
Kube, M.
Lang, M.
Lopatin, I.
Mahlberg, P.
Makonyi, K.
Metag, V.
Meyer, W.
Müller, J.
Müllers, J.
Nanova, M.
Nikonov, V.
Novotny, R.
Piontek, D.
Reicherz, G.
Rostomyan, T.
Sarantsev, A.
Schmidt, Ch.
Schmieden, H.
Seifen, T.
Sokhoyan, V.
Spieker, K.
Thiel, A.
Thoma, U.
Urban, M.
van Pee, H.
Walther, D.
Wendel, Ch.
Werthmüller, D.
Wiedner, U.
Wilson, A.
Winnebeck, A.
Witthauer, L.
Wunderlich, Y.
Publication Year :
2019

Abstract

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.<br />Comment: 21 pages

Subjects

Subjects :
Nuclear Experiment

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1904.12560
Document Type :
Working Paper

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