Radiative pi(0) photoproduction on protons in the Delta(+)(1232) region

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)269-282
Number of pages14
JournalEuropean Physical Journal A: Hadrons and Nuclei
Issue number3
Publication statusPublished - Mar 2010


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