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N* and Delta* decays into N(pi)0(pi)0

: Thoma, U.; Fuchs, M.; Anisovich, A.V.; Anton, G.; Bantes, B.; Bartholomy, O.; Beck, R.; Beloglazov, Y.A.; Crede, V.; Ehmanns, A.; Ernst, J.; Fabry, I.; Flemming, H.; Fosel, A.; Funke, C.; Gothe, R.; Gridnev, A.B.; Gutz, E.; Höffgen, Stefan; Horn, I.; Hossl, J.; Junkersfeld, J.; Kalinowsky, H.; Klein, Frank; Klempt, E.; Koch, H.; Konrad, M.; Kopf, B.; Krusche, B.; Langheinrich, J.; Löhner, H.; Lopatin, I.V.; Lotz, J.; Matthaey, H.; Menze, D.; Nikonov, V.A.; Novinski, D.V.; Ostrick, M.; Pee, H. van; Sarantsev, A.V.; Schmidt, C.; Schmieden, H.; Schoch, B.; Suft, G.; Sumachev, V.; Szczepanek, T.; Walther, D.; Weinheimer, C.


Physics letters. B 659 (2008), Nr.1-2, S.87-93
ISSN: 0031-9163
ISSN: 0370-2693
Fraunhofer INT ()

Decays of baryon resonances in the second and the third resonance region into Eta pi0pi0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of Eta and Deltaresonances decaying into Delta1232pi, Etapi pi sigma, Eta1440Roh-11 pi, and Eta1520Delta-13 pi are determined in a partial wave analysis of this data and of data from other reactions. Serveral partial decay widths were not known before. Interesting decay patterns are observed which are not even qualitatively reproduced by quark model calculations. In the second resonance region, decays into Delta1232pi dominate clearly. The Etapi pi sigma-wave provides a significant contribution to the cross section, especially in the third resonance region. The Roh-131720 properties found here are at clear variance to PDG values.