6533b871fe1ef96bd12d0e6a
RESEARCH PRODUCT
S11 RESONANCES IN A COUPLED-CHANNEL DYNAMICAL MODEL
Shin Nan YangS.s. KamalovGuan-yeu ChenDieter DrechselL. Tiatorsubject
Nuclear physicsPhysicsNuclear and High Energy PhysicsPionAmplitudeScatteringQuantum electrodynamicsResonanceAstronomy and AstrophysicsMultipole expansionHelicityAtomic and Molecular Physics and OpticsCommunication channeldescription
A self-consistent analysis of pion scattering and pion photoproduction within a coupled channels dynamical model is presented. The results indicate the existence of a third and a fourth S11 resonance with the masses 1846±47 and 2113±70 MeV . In the case of pion photoproduction, we found that background contributions to the imaginary part of the S-wave multipole become large and negative in the region of the S11(1535) resonance. Due to this fact, much larger resonance contributions are required in order to explain the results of the recent multipole analysis. For the first S11(1535) resonance we obtain a value of 72±2×10-3 GeV -1/2 for the electromagnetic helicity amplitude A1/2.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-04-10 | International Journal of Modern Physics A |