Helicity amplitudes A1/2 and A3/2 for the D13(1520) resonance obtained from the gamma-->p-->-->ppi(0) Reaction

• Published in: Physical review letters Vol. 88; no. 23; p. 232002
• Main Authors: Ahrens, J, Altieri, S, Annand, J R M, Anton, G, Arends, H-J, Aulenbacher, K, Beck, R, Bradtke, C, Braghieri, A, Degrande, N, D'Hose, N, Drechsel, D, Dutz, H, Goertz, S, Grabmayr, P, Hansen, K, Harmsen, J, Von Harrach, D, Hasegawa, S, Hasegawa, T, Heid, E, Helbing, K, Holvoet, H, Van Hoorebeke, L, Horikawa, N, Iwata, T, Jahn, O, Jennewein, P, Kageya, T, Kamalov, S, Kiel, B, Klein, F, Kondratiev, R, Kossert, K, Krimmer, J, Lang, M, Lannoy, B, Leukel, R, Lisin, V, Matsuda, T, McGeorge, J C, Meier, A, Menze, D, Meyer, W, Michel, T, Naumann, J, Panzeri, A, Pedroni, P, Pinelli, T, Preobrajenski, I, Radtke, E, Reichert, E, Reicherz, G, Rohlof, Ch, Rosner, G, Ryckbosch, D, Sauer, M, Schoch, B, Schumacher, M, Seitz, B, Speckner, T, Takabayashi, N, Tamas, G, Thomas, A, Tiator, L, Van Vyver, R, Wakai, A, Weihofen, W, Wissmann, F, Zapadtka, F, Zeitler, G
• Format: Journal Article
• Language: English
• Published: United States 10.06.2002
• ISSN: 0031-9007

The helicity dependence of the gamma-->p-->-->ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment, performed at the Mainz microtron MAMI, used a 4pi-detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. These data are predominantly sensitive to the D13(1520) resonance and are used to determine its helicity amplitudes.