N* and Delta* decays into N pi0 pi0
Abstract
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.
Cite
@article{arxiv.0707.3592,
title = {N* and Delta* decays into N pi0 pi0},
author = {U. Thoma and M. Fuchs and A. V. Anisovich and G. Anton and R. Bantes and O. Bartholomy and R. Beck and Yu. Beloglazov and V. Crede and A. Ehmanns and J. Ernst and I. Fabry and H. Flemming and A. Foesel and Chr. Funke and R. Gothe and A. Gridnev and E. Gutz and St. Hoeffgen and I. Horn and J. Hoessl and J. Junkersfeld and H. Kalinowsky and F. Klein and E. Klempt and H. Koch and M. Konrad and B. Kopf and B. Krusche and J. Langheinrich and H. Loehner and I. Lopatin and J. Lotz and H. Matthaey and D. Menze and V. A. Nikonov and D. Novinski and M. Ostrick and H. van Pee and A. V. Sarantsev and C. Schmidt and H. Schmieden and B. Schoch and G. Suft and V. Sumachev and T. Szczepanek and D. Walther and Chr. Weinheimer},
journal= {arXiv preprint arXiv:0707.3592},
year = {2015}
}
Comments
13 pages, 4 figures, long author's list