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Radiative pi(0) photoproduction on protons in the Delta(+)(1232) region RID D-4072-2011

Author:
Schumann, S.  Boillat, B.  Downie, E. J.  Aguar-Bartolome, P.  Ahrens, J.  Annand, J. R. M.  Arends, H. J.  Beck, R.  Bekrenev, V.  Braghieri, A.  Branford, D.  Briscoe, W. J.  Brudvik, J. W.  Cherepnya, S.  Codling, R.  Drexler, P.  Fil'kov, L. V.  Glazier, D. I.  Gregor, R.  Heid, E.  Hornidge, D.  Jahn, O.  Kashevarov, V. L.  Kondratiev, R.  Korolija, M.  Kotulla, M.  Krambrich, D.  Krusche, B.  Lang, M.  Lisin, V.  Livingston, K.  Lugert, S.  MacGregor, I. J. D.  Manley, D. M.  Martinez-Fabregate, M.  McGeorge, J. C.  Mekterovic, D.  Metag, V.  Nefkens, B. M. K.  Nikolaev, A.  Novotny, R.  Ostrick, M.  Owens, R. O.  Pedroni, P.  Polonski, A.  Prakhov, S. N.  Price, J. W.  Rosner, G.  Rost, M.  Rostomyan, T.  Sober, D.  Starostin, A.  Supek, I.  Tarbert, C. M.  Thomas, A.  Unverzagt, M.  Walcher, Th.  Watts, D. P.  Zehr, F.  


Journal:
EUROPEAN PHYSICAL JOURNAL A


Issue Date:
2010


Abstract(summary):

The reaction gamma p -> p pi(0)gamma' has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differential cross-sections for the emitted photon gamma' and angular differential cross-sections for the pi(0) have been determined with high statistics in the energy range of the Delta(+)(1232)-resonance. Cross-sections and the ratio of the cross-section to the nonradiative process gamma p -> p pi(0) are compared to theoretical reaction models, having the anomalous magnetic moment kappa(Delta+) as free parameter. As the shape of the experimental distributions is not reproduced in detail by the model calculations, currently no extraction of kappa(Delta+) is feasible.


Page:
269---282


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