Analysis of resonance multipoles from polarization observables in eta photoproduction

Details Analysis of resonance multipoles from polarization observables in eta photoproduction Analysis of resonance multipoles from polarization observables in eta photoproduction

1999-02-11

arxiv.org/abs/nucl-th/9902028v1

Phys.Rev.C60:035210,1999

Physics

Nuclear Physics

Nuclear Theory

14 pages of LATEX including 7 postscript figures

Scientific paper

10.1103/PhysRevC.60.035210

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)%.

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