Measurement of the helicity dependence for the γp→nπ+ channel in the second resonance region

Ahrens, J. et al. (2006) Measurement of the helicity dependence for the γp→nπ+ channel in the second resonance region. Physical Review C, 74(4), 045204. (doi: 10.1103/PhysRevC.74.045204)

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The helicity dependence of the γp→nπ<sup>+</sup> reaction has been measured for the first time in the photon energy range from 450 to 790 MeV. The experiment, performed at the Mainz Microtron (MAMI), used a 4π-detector system, a circularly polarized, tagged photon beam, and a longitudinally polarized frozen-spin target. Although these polarized data are mainly sensitive to mechanisms involving the D<sub>13</sub>(1520) resonance, a cusp structure at the η production threshold can be clearly observed. These data are significantly different from the predictions of the existing multipole analyses and are used to determine the helicity amplitudes of the D<sub>13</sub>(1520) and S<sub>11</sub>(1535) resonances with improved accuracy.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Seitz, Dr Bjoern and Annand, Dr John and Rosner, Professor Guenther
Authors: Ahrens, J., Altieri, S., Annand, J.R.M., Arends, H.J., Beck, R., Bradtke, C., Braghieri, A., dHose, N., Dutz, H., Goertz, S., Grabmayr, P., Hasegawa, S., Heid, E., Holvoet, H., Van Hoorebeke, L., Horikawa, N., Iwata, T., Jahn, O., Jennewein, P., Kamalov, S., Klein, F., Kondratiev, R., Lang, M., Lannoy, B., Lisin, V., Martinez-Fabregate, M., McGeorge, J.C., Meyer, W., Panzeri, A., Pedroni, P., Pinelli, T., Preobrajenski, I., Reicherz, G., Rohlof, C., Rosner, G., Rost, M., Rostomyan, T., Ryckbosch, D., Schumacher, M., Seitz, B., Tamas, G., Thomas, A., Tiator, L., de Vyver, R.V., and Zapadtka, F.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
Published Online:20 October 2006

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