6533b853fe1ef96bd12ad65d
RESEARCH PRODUCT
Analysis of resonance multipoles from polarization observables in eta photoproduction
Dieter DrechselG. KnöchleinC. BennholdL. Tiatorsubject
PhysicsNuclear and High Energy PhysicsParticle physicsMesonNuclear TheoryBranching fractionmedia_common.quotation_subjectHadronFOS: Physical sciencesElementary particleAsymmetryHelicityNuclear Theory (nucl-th)Excited stateHigh Energy Physics::ExperimentNuclear ExperimentBosonmedia_commondescription
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)%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-02-11 |