Intermediate resonance excitation in the reaction

Ahrens, J. et al. (2005) Intermediate resonance excitation in the reaction. Physics Letters B, 624(3-4), pp. 173-180. (doi: 10.1016/j.physletb.2005.08.034)

Abstract

The helicity dependence of the total cross section for the reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The measurement, performed at the tagged photon beam facility of the MAMI accelerator in Mainz, used the large acceptance detector DAPHNE and a longitudinally polarized frozen-spin target. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, most likely due to the intermediate production of the D13(1520) resonance. However, the contribution of the antiparallel spin configuration, arising from other reaction mechanisms, is also not negligible. This result gives important new information to resolve the existing model discrepancies in the identification of the nucleon resonances contributing to this channel.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: McGeorge, Dr John and Seitz, Dr Bjoern and Annand, Dr John and Rosner, Professor Guenther
• 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., 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., 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, C., Rosner, G., Rostomyan, T., Ryckbosch, D., Sauer, M., Schoch, B., Schumacher, M., Seitz, B., Speckner, T., Takabayashi, N., Tamas, G., Thomas, A., van de Vyver, R., Wakai, A., Weihofen, W., Wissmann, F., Zapadtka, F., and Zeitler, G.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physics Letters B
• Publisher: Elsevier BV
• ISSN: 0370-2693