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03 October 2022
  » arxiv » 1507.2488

 Article overview

High statistics study of the reaction $gamma p o p;2pi^0$
V. Sokhoyan ; E. Gutz ; V. Crede ; H. van Pee ; A.V. Anisovich ; J.C.S. Bacelar ; B. Bantes ; O. Bartholomy ; D. Bayadilov ; R. Beck ; Y.A. Beloglazov ; R. Castelijns ; H. Dutz ; D. Elsner ; R. Ewald ; F. Frommberger ; M. Fuchs ; Ch. Funke ; R. Gregor ; A.B. Gridnev ; W. Hillert ; Ph. Hoffmeister ; I. Horn ; I. Jaegle ; J. Junkersfeld ; H. Kalinowsky ; S. Kammer ; V. Kleber ; Frank Klein ; Friedrich Klein ; E. Klempt ; M. Kotulla ; B. Krusche ; M. Lang ; H. Löhner ; I.V. Lopatin ; S. Lugert ; T. Mertens ; J.G. Messchendorp ; V. Metag ; B. Metsch ; M. Nanova ; V.A. Nikonov ; D. Novinsky ; R. Novotny ; M. Ostrick ; L. Pant ; M. Pfeiffer ; D. Piontek ; A. Roy ; A.V. Sarantsev ; Ch. Schmidt ; H. Schmieden ; T. Seifen ; S. Shende ; A. Süle ; V.V. Sumachev ; T. Szczepanek ; A. Thiel ; U. Thoma ; D. Trnka ; R. Varma ; D. Walther ; Ch. Wendel ; A. Wilson ;
Date 9 Jul 2015
AbstractThe photoproduction of 2$pi^0$ 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 600,MeV to 2.5,GeV. Differential and total cross sections and $ppi^0pi^0$ 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 $Delta$ resonances contributing to the $ppi^0pi^0$ final state were determined within the BnGa partial wave analysis. The data presented here allow us to determine branching ratios of nucleon and $Delta$ resonances for their decays into $ppi^0pi^0$ via several intermediate states. Most prominent are decays proceeding via $Delta(1232)pi$, $N(1440)1/2^+pi$, $N(1520)3/2^-pi$, $N(1680)5/2^+pi$, but also $pf_0(500)$, $pf_0(980)$, and $pf_2(1270)$ contribute to the reaction.
Source arXiv, 1507.2488
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