Analysis of resonance multipoles from polarization observables in eta photoproduction

Abstract

A combined analysis of new eta photoproduction data for total and differential cross sections, target asymmetry and photon asymmetry is presented. Using a few reasonable assumptions we perform the first model-independent analysis of the E0+, E2- and M2- eta photoproduction multipoles. Making use of the well-known A3/2 helicity amplitude of the D13(1520) state we extract its branching ratio to the eta-N channel, Gamma(eta,N)/Gamma = (0.08 +- 0.01)%. At higher energies, we show that the photon asymmetry is extremely sensitive to small multipoles that are excited by photons in the helicity 3/2 state. The new GRAAL photon asymmetry data at higher energy show a clear signal of the F15(1680) excitation which permits extracting an F15(1680)->eta,N branching ratio of (0.15 +0.35 -0.10)%.

arXiv comment14 pages of LATEX including 7 postscript figures

References in corpus (10)

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• Photon- and meson-induced reactions on the nucleon
• Updated resonance photo-decay amplitudes to 2 GeV
• A unitary model for meson-nucleon scattering
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• Photo- and Electroproduction of Eta Mesons
• eta-meson photoproduction off protons and deuterons
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• Photoproduction of the Etas near Threshold

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