Double-polarization observable G in neutral-pion photoproduction off the proton

. This paper reports on a measurement of the double-polarization observable G in π 0 photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly polarized photons with longitudinally polarized protons. The...

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Veröffentlicht in:	The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2017, Vol.53 (1), p.1-12, Article 8
Hauptverfasser:	Thiel, A., Eberhardt, H., Lang, M., Afzal, F., Anisovich, A. V., Bantes, B., Bayadilov, D., Beck, R., Bichow, M., Brinkmann, K. -T., Böse, S., Crede, V., Dieterle, M., Dutz, H., Elsner, D., Ewald, R., Fornet-Ponse, K., Friedrich, St, Frommberger, F., Funke, Ch, Goertz, St, Gottschall, M., Gridnev, A., Grüner, M., Gutz, E., Hammann, D., Hammann, Ch, Hannappel, J., Hartmann, J., Hillert, W., Hoffmeister, Ph, Honisch, Ch, Jude, T., Kaiser, D., Kalinowsky, H., Kalischewski, F., Kammer, S., Keshelashvili, I., Klassen, P., Kleber, V., Klein, F., Klempt, E., Koop, K., Krusche, B., Kube, M., Lopatin, I., Mahlberg, Ph, Makonyi, K., Metag, V., Meyer, W., Müller, J., Müllers, J., Nanova, M., Nikonov, V., Piontek, D., Reeve, S., Reicherz, G., Runkel, S., Sarantsev, A., Schmidt, Ch, Schmieden, H., Seifen, T., Sokhoyan, V., Spieker, K., Thoma, U., Urban, M., van Pee, H., Walther, D., Wendel, Ch, Wilson, A., Winnebeck, A., Witthauer, L.
Format:	Artikel
Sprache:	eng
Schlagworte:	Bremsstrahlung Butanol Diamonds Hadrons Heavy Ions Multipoles Nuclear Fusion Nuclear Physics Particle and Nuclear Physics Photons Photoproduction Physics Physics and Astronomy Polarization Regular Article - Experimental Physics
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Zusammenfassung:	. This paper reports on a measurement of the double-polarization observable G in π 0 photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly polarized photons with longitudinally polarized protons. The polarized photons are produced by bremsstrahlung off a diamond radiator of well-defined orientation. A frozen spin butanol target provides the polarized protons. The data cover the photon energy range from 617 to 1325 MeV and a wide angular range. The experimental results for G are compared to predictions by the Bonn-Gatchina (BnGa), Jülich-Bonn (JüBo), MAID and SAID partial wave analyses. Implications of the new data for the pion photoproduction multipoles are discussed.
ISSN:	1434-6001 1434-601X
DOI:	10.1140/epja/i2017-12194-8