Speaker
Denisa Trnková
(Nuclear Physics Institute, Řež)
Description
We use isobar models to describe the γp → η′p process. The amplitude is constructed as a sum of tree-level Feynman diagrams with proton and nucleon resonance exchanges in the s and u channels and ρ and ω meson exchanges in the t channel. The free parameters of the models are fitted to differential cross section and photon-beam asymmetry data. Three different isobar models are compared with the experimental data, and the roles of the individual resonances are discussed. We find the N(1875)3/2⁻, N(1895)1/2⁻, N(1900)3/2⁺, N(2100)1/2⁺, and N(2120)3/2⁻ states to be the most important for achieving a good description of the data. Predictions for the recoil-proton and target polarization asymmetry are also presented.
| Theoretical or experimental | Theoretical |
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Author
Denisa Trnková
(Nuclear Physics Institute, Řež)