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

J. Ahrens, S. Altieri, J. R.M. Annand, H. J. Arends, R. Beck, C. Bradtke, A. Braghieri, N. D'Hose, H. Dutz, S. Goertz, P. Grabmayr, S. Hasegawa, E. Heid, H. Holvoet, L. Van Hoorebeke, N. Horikawa, T. Iwata, O. Jahn, P. Jennewein, S. KamalovF. Klein, R. Kondratiev, M. Lang, B. Lannoy, V. Lisin, M. Martinez-Fabregate, J. C. McGeorge, W. Meyer, A. Panzeri, P. Pedroni, T. Pinelli, I. Preobrajenski, G. Reicherz, Ch Rohlof, G. Rosner, M. Rost, T. Rostomyan, D. Ryckbosch, M. Schumacher, B. Seitz, G. Tamas, A. Thomas, L. Tiator, R. Van De Vyver, F. Zapadtka

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27 Citations (Scopus)


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.

Original languageEnglish
Article number045204
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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