High statistics study of the reaction γp→ p2π⁰
Sokhoyan, V. · Gutz, E. · Crede, V. · van Pee, H. · Anisovich, A. V. · Bacelar, J. C. S. · Bantes, B. · Bartholomy, O. · Bayadilov, D. · Beck, R. · Beloglazov, Y. A. · Castelijns, R. · Dutz, H. · Elsner, D. · Ewald, R. · Frommberger, F. · Fuchs, M. · Funke, Ch. · Gregor, R. · Gridnev, A. B. · Hillert, W. · Hoffmeister, Ph. · Horn, I. · Jaegle, I. · Junkersfeld, J. · Kalinowsky, H. · Kammer, S. · Kleber, V. · Klein, Frank · Klein, Friedrich · Klempt, E. · Kotulla, M. · Krusche, B. · Lang, M. · Löhner, H. · Lopatin, I. V. · Lugert, S. · Mertens, T. · Messchendorp, J. G. · Metag, V. · Metsch, B. · Nanova, M. · Nikonov, V. A. · Novinsky, D. · Novotny, R. · Ostrick, M. · Pant, L. · Pfeiffer, M. · Piontek, D. · Roy, A. · Sarantsev, A. V. · Schmidt, Ch. · Schmieden, H. · Seifen, T. · Shende, S. · Süle, A. · Sumachev, V. V. · Szczepanek, T. · Thiel, A. · Thoma, U. · Trnka, D. · Varma, R. · Walther, D. · Wendel, Ch. · Wilson, A.
Original · EN
The photoproduction of 2π⁰ mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600MeV to 2.5GeV. Differential and total cross sections and pπ⁰π⁰ Dalitz plots are presented. Part of the data was taken with a diamond radiator producing linearly polarized photons, and beam asymmetries were derived. Properties of nucleon and Δ resonances contributing to the pπ⁰π⁰ final state were determined within the BnGa partial wave analysis. The data presented here allow us to determine branching ratios of nucleon and Δ resonances for their decays into pπ⁰π⁰ via several intermediate states. Most prominent are decays proceeding via Δ(1232)π, N(1440)1/2+π, N(1520)3/2-π, N(1680)5/2+π, but also pf₀(500), pf₀(980), and pf₂(1270) contribute to the reaction.
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