Published August 2015 | Version v1
Journal article

High-statistics study of the reaction γp → p2π0

Description

The photoproduction of 2π 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 pπ 0 π 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 Δ resonances contributing to the pπ 0 π 0 final state were determined within the Bonn-Gatchina (BnGa) partial-wave analysis. The data presented here allow us to determine branching ratios of nucleon and Δ resonances for their decays into pπ 0 π 0 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. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epja/i2015-15095-x

Additional details

Identifiers

Publishing Information

Journal Title
European Physical Journal. A
Journal Volume
51
Journal Issue
8
Journal Page Range
p. 1-29
ISSN
1434-6001

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