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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 | | Abstract: | The 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 | | Services: | Forum | Review | PDF | Favorites | |
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