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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Abstract

The helicity dependence of the γp→nπ+ 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 D13(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 D13(1520) and S11(1535) resonances with improved accuracy.

Item Type:Articles
Status:Published
Refereed:Yes
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
ISSN:0556-2813
Published Online:20 October 2006

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