Details

Autor(en) / Beteiligte

• Gottschall, M
• Anisovich, A V
• Bantes, B
• Bayadilov, D
• Beck, R
• Bichow, M
• Böse, S
• Brinkmann, K-Th
• Challand, Th
• Crede, V
• Dietz, F
• Dutz, H
• Eberhardt, H
• Elsner, D
• Ewald, R
• Fornet-Ponse, K
• Friedrich, St
• Frommberger, F
• Funke, Ch
• Gridnev, A
• Grüner, M
• Gutz, E
• Hammann, Ch
• Hannappel, J
• Hartmann, J
• Hillert, W
• Hoffmeister, Ph
• Honisch, Ch
• Jaegle, I
• Kaiser, D
• Kalinowsky, H
• Kammer, S
• Keshelashvili, I
• Klein, F
• Klempt, E
• Koop, K
• Krusche, B
• Kube, M
• Lang, M
• Lopatin, I
• Maghrbi, Y
• Makonyi, K
• Metag, V
• Meyer, W
• Müller, J
• Nanova, M
• Nikonov, V
• Novotny, R
• Piontek, D
• Reicherz, G
• Rostomyan, T
• Sarantsev, A
• Schaepe, St
• Schmidt, Ch
• Schmieden, H
• Schmitz, R
• Seifen, T
• Sokhoyan, V
• Thiel, A
• Thoma, U
• Urban, M
• van Pee, H
• Walther, D
• Wendel, Ch
• Wiedner, U
• Wilson, A
• Winnebeck, A

Titel

First measurement of the helicity asymmetry for γp → pπ0 in the resonance region

Ist Teil von

• Physical review letters, 2014-01, Vol.112 (1), p.012003-012003

Ort / Verlag

United States

Erscheinungsjahr

2014

Link zum Volltext

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300 MeV, covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, and BnGa partial wave analyses. Strikingly large differences between data and predictions are observed, which are traced to differences in the helicity amplitudes of well-known and established resonances. Precise values for the helicity amplitudes of several resonances are reported.