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N* and Delta* decays into N pi0 pi0

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arxiv 0707.3592 v4 pith:O6KS6WFV submitted 2007-07-24 hep-ph

U. Thoma , M. Fuchs , A.V. Anisovich , G. Anton , R. Bantes , O. Bartholomy , R. Beck , Yu. Beloglazov
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V. Crede A. Ehmanns J. Ernst I. Fabry H. Flemming A. Foesel Chr. Funke R. Gothe A. Gridnev E. Gutz St. Hoeffgen I. Horn J. Hoessl J. Junkersfeld H. Kalinowsky F. Klein E. Klempt H. Koch M. Konrad B. Kopf B. Krusche J. Langheinrich H. Loehner I. Lopatin J. Lotz H. Matthaey D. Menze V.A. Nikonov D. Novinski M. Ostrick H. van Pee A.V. Sarantsev C. Schmidt H. Schmieden B. Schoch G. Suft V. Sumachev T. Szczepanek D. Walther Chr. Weinheimer
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Decays of baryon resonances in the second and the third resonance region into N pi0 pi0 are studied by photoproduction of two neutral pions off protons. Partial decay widths of N* and Delta* resonances decaying into Delta(1232) pi, N(\pi\pi)_{S}, N(1440)P_{11} pi, and N(1520)D_{13} pi are determined in a partial wave analysis of this data, and data from other reactions. Several 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 Delta(1232) pi dominate clearly. The N(\pi\pi)_{S}-wave provides a significant contribution to the cross section, especially in the third resonance region. The P_{13}(1720) properties found here are at clear variance to PDG values.

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